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@@ -5,782 +5,55 @@
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Usage
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=====
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-|project_name| consists of a number of commands. Each command accepts
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-a number of arguments and options. The following sections will describe each
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-command in detail.
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-
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-General
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--------
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-
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-.. include:: usage_general.rst.inc
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-
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-In case you are interested in more details (like formulas), please see
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-:ref:`internals`. For details on the available JSON output, refer to
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-:ref:`json_output`.
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-
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-Common options
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-~~~~~~~~~~~~~~
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-
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-All |project_name| commands share these options:
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-
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-.. include:: usage/common-options.rst.inc
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-
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-.. include:: usage/init.rst.inc
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-
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-Examples
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-~~~~~~~~
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-::
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-
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- # Local repository, repokey encryption, BLAKE2b (often faster, since Borg 1.1)
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- $ borg init --encryption=repokey-blake2 /path/to/repo
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-
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- # Local repository (no encryption)
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- $ borg init --encryption=none /path/to/repo
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-
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- # Remote repository (accesses a remote borg via ssh)
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- $ borg init --encryption=repokey-blake2 user@hostname:backup
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-
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- # Remote repository (store the key your home dir)
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- $ borg init --encryption=keyfile user@hostname:backup
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-
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-.. include:: usage/create.rst.inc
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-
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-Examples
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-~~~~~~~~
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-::
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-
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- # Backup ~/Documents into an archive named "my-documents"
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- $ borg create /path/to/repo::my-documents ~/Documents
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-
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- # same, but list all files as we process them
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- $ borg create --list /path/to/repo::my-documents ~/Documents
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-
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- # Backup ~/Documents and ~/src but exclude pyc files
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- $ borg create /path/to/repo::my-files \
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- ~/Documents \
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- ~/src \
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- --exclude '*.pyc'
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-
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- # Backup home directories excluding image thumbnails (i.e. only
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- # /home/*/.thumbnails is excluded, not /home/*/*/.thumbnails)
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- $ borg create /path/to/repo::my-files /home \
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- --exclude 're:^/home/[^/]+/\.thumbnails/'
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-
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- # Do the same using a shell-style pattern
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- $ borg create /path/to/repo::my-files /home \
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- --exclude 'sh:/home/*/.thumbnails'
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-
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- # Backup the root filesystem into an archive named "root-YYYY-MM-DD"
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- # use zlib compression (good, but slow) - default is lz4 (fast, low compression ratio)
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- $ borg create -C zlib,6 /path/to/repo::root-{now:%Y-%m-%d} / --one-file-system
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-
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- # Backup a remote host locally ("pull" style) using sshfs
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- $ mkdir sshfs-mount
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- $ sshfs root@example.com:/ sshfs-mount
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- $ cd sshfs-mount
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- $ borg create /path/to/repo::example.com-root-{now:%Y-%m-%d} .
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- $ cd ..
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- $ fusermount -u sshfs-mount
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-
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- # Make a big effort in fine granular deduplication (big chunk management
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- # overhead, needs a lot of RAM and disk space, see formula in internals
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- # docs - same parameters as borg < 1.0 or attic):
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- $ borg create --chunker-params 10,23,16,4095 /path/to/repo::small /smallstuff
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-
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- # Backup a raw device (must not be active/in use/mounted at that time)
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- $ dd if=/dev/sdx bs=10M | borg create /path/to/repo::my-sdx -
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-
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- # No compression (default)
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- $ borg create /path/to/repo::arch ~
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-
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- # Super fast, low compression
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- $ borg create --compression lz4 /path/to/repo::arch ~
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-
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- # Less fast, higher compression (N = 0..9)
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- $ borg create --compression zlib,N /path/to/repo::arch ~
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-
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- # Even slower, even higher compression (N = 0..9)
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- $ borg create --compression lzma,N /path/to/repo::arch ~
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-
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- # Use short hostname, user name and current time in archive name
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- $ borg create /path/to/repo::{hostname}-{user}-{now} ~
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- # Similar, use the same datetime format as borg 1.1 will have as default
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- $ borg create /path/to/repo::{hostname}-{user}-{now:%Y-%m-%dT%H:%M:%S} ~
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- # As above, but add nanoseconds
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- $ borg create /path/to/repo::{hostname}-{user}-{now:%Y-%m-%dT%H:%M:%S.%f} ~
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-
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- # Backing up relative paths by moving into the correct directory first
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- $ cd /home/user/Documents
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- # The root directory of the archive will be "projectA"
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- $ borg create /path/to/repo::daily-projectA-{now:%Y-%m-%d} projectA
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-
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-
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-.. include:: usage/extract.rst.inc
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-
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-Examples
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-~~~~~~~~
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-::
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-
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- # Extract entire archive
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- $ borg extract /path/to/repo::my-files
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-
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- # Extract entire archive and list files while processing
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- $ borg extract --list /path/to/repo::my-files
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-
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- # Verify whether an archive could be successfully extracted, but do not write files to disk
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- $ borg extract --dry-run /path/to/repo::my-files
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-
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- # Extract the "src" directory
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- $ borg extract /path/to/repo::my-files home/USERNAME/src
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-
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- # Extract the "src" directory but exclude object files
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- $ borg extract /path/to/repo::my-files home/USERNAME/src --exclude '*.o'
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-
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- # Restore a raw device (must not be active/in use/mounted at that time)
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- $ borg extract --stdout /path/to/repo::my-sdx | dd of=/dev/sdx bs=10M
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-
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-
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-.. Note::
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-
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- Currently, extract always writes into the current working directory ("."),
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- so make sure you ``cd`` to the right place before calling ``borg extract``.
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-
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-.. include:: usage/check.rst.inc
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-
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-.. include:: usage/rename.rst.inc
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-
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-Examples
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-~~~~~~~~
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-::
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-
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- $ borg create /path/to/repo::archivename ~
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- $ borg list /path/to/repo
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- archivename Mon, 2016-02-15 19:50:19
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-
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- $ borg rename /path/to/repo::archivename newname
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- $ borg list /path/to/repo
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- newname Mon, 2016-02-15 19:50:19
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-
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-
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-.. include:: usage/list.rst.inc
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-
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-Examples
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-~~~~~~~~
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-::
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-
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- $ borg list /path/to/repo
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- Monday Mon, 2016-02-15 19:15:11
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- repo Mon, 2016-02-15 19:26:54
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- root-2016-02-15 Mon, 2016-02-15 19:36:29
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- newname Mon, 2016-02-15 19:50:19
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- ...
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-
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- $ borg list /path/to/repo::root-2016-02-15
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- drwxr-xr-x root root 0 Mon, 2016-02-15 17:44:27 .
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- drwxrwxr-x root root 0 Mon, 2016-02-15 19:04:49 bin
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- -rwxr-xr-x root root 1029624 Thu, 2014-11-13 00:08:51 bin/bash
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- lrwxrwxrwx root root 0 Fri, 2015-03-27 20:24:26 bin/bzcmp -> bzdiff
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- -rwxr-xr-x root root 2140 Fri, 2015-03-27 20:24:22 bin/bzdiff
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- ...
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-
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- $ borg list /path/to/repo::archiveA --list-format="{mode} {user:6} {group:6} {size:8d} {isomtime} {path}{extra}{NEWLINE}"
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- drwxrwxr-x user user 0 Sun, 2015-02-01 11:00:00 .
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- drwxrwxr-x user user 0 Sun, 2015-02-01 11:00:00 code
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- drwxrwxr-x user user 0 Sun, 2015-02-01 11:00:00 code/myproject
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- -rw-rw-r-- user user 1416192 Sun, 2015-02-01 11:00:00 code/myproject/file.ext
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- ...
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-
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-
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-.. include:: usage/diff.rst.inc
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-
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-Examples
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-~~~~~~~~
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-::
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-
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- $ borg init -e=none testrepo
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- $ mkdir testdir
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- $ cd testdir
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- $ echo asdf > file1
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- $ dd if=/dev/urandom bs=1M count=4 > file2
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- $ touch file3
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- $ borg create ../testrepo::archive1 .
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-
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- $ chmod a+x file1
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- $ echo "something" >> file2
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- $ borg create ../testrepo::archive2 .
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-
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- $ rm file3
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- $ touch file4
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- $ borg create ../testrepo::archive3 .
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-
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- $ cd ..
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- $ borg diff testrepo::archive1 archive2
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- [-rw-r--r-- -> -rwxr-xr-x] file1
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- +135 B -252 B file2
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-
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- $ borg diff testrepo::archive2 archive3
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- added 0 B file4
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- removed 0 B file3
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-
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- $ borg diff testrepo::archive1 archive3
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- [-rw-r--r-- -> -rwxr-xr-x] file1
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- +135 B -252 B file2
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- added 0 B file4
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- removed 0 B file3
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-
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-.. include:: usage/delete.rst.inc
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-
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-Examples
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-~~~~~~~~
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-::
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-
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- # delete a single backup archive:
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- $ borg delete /path/to/repo::Monday
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-
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- # delete the whole repository and the related local cache:
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- $ borg delete /path/to/repo
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- You requested to completely DELETE the repository *including* all archives it contains:
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- repo Mon, 2016-02-15 19:26:54
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- root-2016-02-15 Mon, 2016-02-15 19:36:29
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- newname Mon, 2016-02-15 19:50:19
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- Type 'YES' if you understand this and want to continue: YES
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-
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-
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-.. include:: usage/prune.rst.inc
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-
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-Examples
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-~~~~~~~~
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-
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-Be careful, prune is a potentially dangerous command, it will remove backup
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-archives.
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-
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-The default of prune is to apply to **all archives in the repository** unless
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-you restrict its operation to a subset of the archives using ``--prefix``.
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-When using ``--prefix``, be careful to choose a good prefix - e.g. do not use a
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-prefix "foo" if you do not also want to match "foobar".
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-
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-It is strongly recommended to always run ``prune -v --list --dry-run ...``
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-first so you will see what it would do without it actually doing anything.
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-
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-There is also a visualized prune example in ``docs/misc/prune-example.txt``.
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-
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-::
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-
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- # Keep 7 end of day and 4 additional end of week archives.
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- # Do a dry-run without actually deleting anything.
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- $ borg prune -v --list --dry-run --keep-daily=7 --keep-weekly=4 /path/to/repo
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-
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- # Same as above but only apply to archive names starting with the hostname
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- # of the machine followed by a "-" character:
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- $ borg prune -v --list --keep-daily=7 --keep-weekly=4 --prefix='{hostname}-' /path/to/repo
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-
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- # Keep 7 end of day, 4 additional end of week archives,
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- # and an end of month archive for every month:
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- $ borg prune -v --list --keep-daily=7 --keep-weekly=4 --keep-monthly=-1 /path/to/repo
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-
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- # Keep all backups in the last 10 days, 4 additional end of week archives,
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- # and an end of month archive for every month:
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- $ borg prune -v --list --keep-within=10d --keep-weekly=4 --keep-monthly=-1 /path/to/repo
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-
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-
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-.. include:: usage/info.rst.inc
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-
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-Examples
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-~~~~~~~~
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-::
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-
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- $ borg info /path/to/repo::root-2016-02-15
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- Name: root-2016-02-15
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- Fingerprint: 57c827621f21b000a8d363c1e163cc55983822b3afff3a96df595077a660be50
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- Hostname: myhostname
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- Username: root
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- Time (start): Mon, 2016-02-15 19:36:29
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- Time (end): Mon, 2016-02-15 19:39:26
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- Command line: /usr/local/bin/borg create --list -C zlib,6 /path/to/repo::root-2016-02-15 / --one-file-system
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- Number of files: 38100
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-
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- Original size Compressed size Deduplicated size
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- This archive: 1.33 GB 613.25 MB 571.64 MB
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- All archives: 1.63 GB 853.66 MB 584.12 MB
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-
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- Unique chunks Total chunks
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- Chunk index: 36858 48844
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-
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-
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-.. include:: usage/mount.rst.inc
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-
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-.. include:: usage/umount.rst.inc
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-
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-Examples
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-~~~~~~~~
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-
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-borg mount
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-++++++++++
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-::
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-
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- $ borg mount /path/to/repo::root-2016-02-15 /tmp/mymountpoint
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- $ ls /tmp/mymountpoint
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- bin boot etc home lib lib64 lost+found media mnt opt root sbin srv tmp usr var
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- $ borg umount /tmp/mymountpoint
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-
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-::
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-
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- $ borg mount -o versions /path/to/repo /tmp/mymountpoint
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- $ ls -l /tmp/mymountpoint/home/user/doc.txt/
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- total 24
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- -rw-rw-r-- 1 user group 12357 Aug 26 21:19 doc.txt.cda00bc9
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- -rw-rw-r-- 1 user group 12204 Aug 26 21:04 doc.txt.fa760f28
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- $ fusermount -u /tmp/mymountpoint
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-
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-borgfs
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-++++++
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-::
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-
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- $ echo '/mnt/backup /tmp/myrepo fuse.borgfs defaults,noauto 0 0' >> /etc/fstab
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- $ echo '/mnt/backup::root-2016-02-15 /tmp/myarchive fuse.borgfs defaults,noauto 0 0' >> /etc/fstab
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- $ mount /tmp/myrepo
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- $ mount /tmp/myarchive
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- $ ls /tmp/myrepo
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- root-2016-02-01 root-2016-02-2015
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- $ ls /tmp/myarchive
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- bin boot etc home lib lib64 lost+found media mnt opt root sbin srv tmp usr var
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-
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-.. Note::
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-
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- ``borgfs`` will be automatically provided if you used a distribution
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- package, ``pip`` or ``setup.py`` to install |project_name|. Users of the
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- standalone binary will have to manually create a symlink (see
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- :ref:`pyinstaller-binary`).
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-
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-.. include:: usage/key_export.rst.inc
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-
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-
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-.. include:: usage/key_import.rst.inc
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-
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-.. _borg-change-passphrase:
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-
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-.. include:: usage/key_change-passphrase.rst.inc
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-
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-Examples
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-~~~~~~~~
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-::
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-
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- # Create a key file protected repository
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- $ borg init --encryption=keyfile -v /path/to/repo
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- Initializing repository at "/path/to/repo"
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- Enter new passphrase:
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- Enter same passphrase again:
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- Remember your passphrase. Your data will be inaccessible without it.
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- Key in "/root/.config/borg/keys/mnt_backup" created.
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- Keep this key safe. Your data will be inaccessible without it.
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- Synchronizing chunks cache...
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- Archives: 0, w/ cached Idx: 0, w/ outdated Idx: 0, w/o cached Idx: 0.
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- Done.
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-
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- # Change key file passphrase
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- $ borg key change-passphrase -v /path/to/repo
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- Enter passphrase for key /root/.config/borg/keys/mnt_backup:
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- Enter new passphrase:
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- Enter same passphrase again:
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- Remember your passphrase. Your data will be inaccessible without it.
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- Key updated
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-
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-Fully automated using environment variables:
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-
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-::
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-
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- $ BORG_NEW_PASSPHRASE=old borg init -e=repokey repo
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- # now "old" is the current passphrase.
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- $ BORG_PASSPHRASE=old BORG_NEW_PASSPHRASE=new borg key change-passphrase repo
|
|
|
- # now "new" is the current passphrase.
|
|
|
-
|
|
|
-
|
|
|
-.. include:: usage/serve.rst.inc
|
|
|
-
|
|
|
-Examples
|
|
|
-~~~~~~~~
|
|
|
-
|
|
|
-borg serve has special support for ssh forced commands (see ``authorized_keys``
|
|
|
-example below): it will detect that you use such a forced command and extract
|
|
|
-the value of the ``--restrict-to-path`` option(s).
|
|
|
-
|
|
|
-It will then parse the original command that came from the client, makes sure
|
|
|
-that it is also ``borg serve`` and enforce path restriction(s) as given by the
|
|
|
-forced command. That way, other options given by the client (like ``--info`` or
|
|
|
-``--umask``) are preserved (and are not fixed by the forced command).
|
|
|
-
|
|
|
-Environment variables (such as BORG_HOSTNAME_IS_UNIQUE) contained in the original
|
|
|
-command sent by the client are *not* interpreted, but ignored. If BORG_XXX environment
|
|
|
-variables should be set on the ``borg serve`` side, then these must be set in system-specific
|
|
|
-locations like ``/etc/environment`` or in the forced command itself (example below).
|
|
|
-
|
|
|
-::
|
|
|
-
|
|
|
- # Allow an SSH keypair to only run borg, and only have access to /path/to/repo.
|
|
|
- # Use key options to disable unneeded and potentially dangerous SSH functionality.
|
|
|
- # This will help to secure an automated remote backup system.
|
|
|
- $ cat ~/.ssh/authorized_keys
|
|
|
- command="borg serve --restrict-to-path /path/to/repo",no-pty,no-agent-forwarding,no-port-forwarding,no-X11-forwarding,no-user-rc ssh-rsa AAAAB3[...]
|
|
|
-
|
|
|
- # Set a BORG_XXX environment variable on the "borg serve" side
|
|
|
- $ cat ~/.ssh/authorized_keys
|
|
|
- command="export BORG_XXX=value; borg serve [...]",restrict ssh-rsa [...]
|
|
|
-
|
|
|
-.. include:: usage/upgrade.rst.inc
|
|
|
-
|
|
|
-Examples
|
|
|
-~~~~~~~~
|
|
|
-::
|
|
|
-
|
|
|
- # Upgrade the borg repository to the most recent version.
|
|
|
- $ borg upgrade -v /path/to/repo
|
|
|
- making a hardlink copy in /path/to/repo.upgrade-2016-02-15-20:51:55
|
|
|
- opening attic repository with borg and converting
|
|
|
- no key file found for repository
|
|
|
- converting repo index /path/to/repo/index.0
|
|
|
- converting 1 segments...
|
|
|
- converting borg 0.xx to borg current
|
|
|
- no key file found for repository
|
|
|
-
|
|
|
-.. _borg_key_migrate-to-repokey:
|
|
|
-
|
|
|
-Upgrading a passphrase encrypted attic repo
|
|
|
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
|
-
|
|
|
-attic offered a "passphrase" encryption mode, but this was removed in borg 1.0
|
|
|
-and replaced by the "repokey" mode (which stores the passphrase-protected
|
|
|
-encryption key into the repository config).
|
|
|
-
|
|
|
-Thus, to upgrade a "passphrase" attic repo to a "repokey" borg repo, 2 steps
|
|
|
-are needed, in this order:
|
|
|
-
|
|
|
-- borg upgrade repo
|
|
|
-- borg key migrate-to-repokey repo
|
|
|
-
|
|
|
-
|
|
|
-.. include:: usage/recreate.rst.inc
|
|
|
-
|
|
|
-Examples
|
|
|
-~~~~~~~~
|
|
|
-::
|
|
|
-
|
|
|
- # Make old (Attic / Borg 0.xx) archives deduplicate with Borg 1.x archives
|
|
|
- # Archives created with Borg 1.1+ and the default chunker params are skipped (archive ID stays the same)
|
|
|
- $ borg recreate /mnt/backup --chunker-params default --progress
|
|
|
-
|
|
|
- # Create a backup with little but fast compression
|
|
|
- $ borg create /mnt/backup::archive /some/files --compression lz4
|
|
|
- # Then compress it - this might take longer, but the backup has already completed, so no inconsistencies
|
|
|
- # from a long-running backup job.
|
|
|
- $ borg recreate /mnt/backup::archive --recompress --compression zlib,9
|
|
|
-
|
|
|
- # Remove unwanted files from all archives in a repository
|
|
|
- $ borg recreate /mnt/backup -e /home/icke/Pictures/drunk_photos
|
|
|
-
|
|
|
-
|
|
|
- # Change archive comment
|
|
|
- $ borg create --comment "This is a comment" /mnt/backup::archivename ~
|
|
|
- $ borg info /mnt/backup::archivename
|
|
|
- Name: archivename
|
|
|
- Fingerprint: ...
|
|
|
- Comment: This is a comment
|
|
|
- ...
|
|
|
- $ borg recreate --comment "This is a better comment" /mnt/backup::archivename
|
|
|
- $ borg info /mnt/backup::archivename
|
|
|
- Name: archivename
|
|
|
- Fingerprint: ...
|
|
|
- Comment: This is a better comment
|
|
|
- ...
|
|
|
-
|
|
|
-.. include:: usage/export-tar.rst.inc
|
|
|
-
|
|
|
-Examples
|
|
|
-~~~~~~~~
|
|
|
-::
|
|
|
-
|
|
|
- # export as uncompressed tar
|
|
|
- $ borg export-tar /path/to/repo::Monday Monday.tar
|
|
|
-
|
|
|
- # exclude some types, compress using gzip
|
|
|
- $ borg export-tar /path/to/repo::Monday Monday.tar.gz --exclude '*.so'
|
|
|
-
|
|
|
- # use higher compression level with gzip
|
|
|
- $ borg export-tar testrepo::linux --tar-filter="gzip -9" Monday.tar.gz
|
|
|
-
|
|
|
- # export a gzipped tar, but instead of storing it on disk,
|
|
|
- # upload it to a remote site using curl.
|
|
|
- $ borg export-tar ... --tar-filter="gzip" - | curl --data-binary @- https://somewhere/to/POST
|
|
|
-
|
|
|
-.. include:: usage/with-lock.rst.inc
|
|
|
-
|
|
|
-
|
|
|
-.. include:: usage/break-lock.rst.inc
|
|
|
-
|
|
|
-
|
|
|
-Miscellaneous Help
|
|
|
-------------------
|
|
|
-
|
|
|
-.. include:: usage/help.rst.inc
|
|
|
-
|
|
|
-
|
|
|
-Debugging Facilities
|
|
|
---------------------
|
|
|
-
|
|
|
-There is a ``borg debug`` command that has some subcommands which are all
|
|
|
-**not intended for normal use** and **potentially very dangerous** if used incorrectly.
|
|
|
-
|
|
|
-For example, ``borg debug put-obj`` and ``borg debug delete-obj`` will only do
|
|
|
-what their name suggests: put objects into repo / delete objects from repo.
|
|
|
-
|
|
|
-Please note:
|
|
|
-
|
|
|
-- they will not update the chunks cache (chunks index) about the object
|
|
|
-- they will not update the manifest (so no automatic chunks index resync is triggered)
|
|
|
-- they will not check whether the object is in use (e.g. before delete-obj)
|
|
|
-- they will not update any metadata which may point to the object
|
|
|
-
|
|
|
-They exist to improve debugging capabilities without direct system access, e.g.
|
|
|
-in case you ever run into some severe malfunction. Use them only if you know
|
|
|
-what you are doing or if a trusted |project_name| developer tells you what to do.
|
|
|
-
|
|
|
-Borg has a ``--debug-topic TOPIC`` option to enable specific debugging messages. Topics
|
|
|
-are generally not documented.
|
|
|
-
|
|
|
-A ``--debug-profile FILE`` option exists which writes a profile of the main program's
|
|
|
-execution to a file. The format of these files is not directly compatible with the
|
|
|
-Python profiling tools, since these use the "marshal" format, which is not intended
|
|
|
-to be secure (quoting the Python docs: "Never unmarshal data received from an untrusted
|
|
|
-or unauthenticated source.").
|
|
|
-
|
|
|
-The ``borg debug profile-convert`` command can be used to take a Borg profile and convert
|
|
|
-it to a profile file that is compatible with the Python tools.
|
|
|
-
|
|
|
-Additionally, if the filename specified for ``--debug-profile`` ends with ".pyprof" a
|
|
|
-Python compatible profile is generated. This is only intended for local use by developers.
|
|
|
-
|
|
|
-Additional Notes
|
|
|
-----------------
|
|
|
-
|
|
|
-Here are misc. notes about topics that are maybe not covered in enough detail in the usage section.
|
|
|
-
|
|
|
-.. _chunker-params:
|
|
|
-
|
|
|
---chunker-params
|
|
|
-~~~~~~~~~~~~~~~~
|
|
|
-
|
|
|
-The chunker params influence how input files are cut into pieces (chunks)
|
|
|
-which are then considered for deduplication. They also have a big impact on
|
|
|
-resource usage (RAM and disk space) as the amount of resources needed is
|
|
|
-(also) determined by the total amount of chunks in the repository (see
|
|
|
-`Indexes / Caches memory usage` for details).
|
|
|
-
|
|
|
-``--chunker-params=10,23,16,4095`` results in a fine-grained deduplication
|
|
|
-and creates a big amount of chunks and thus uses a lot of resources to manage
|
|
|
-them. This is good for relatively small data volumes and if the machine has a
|
|
|
-good amount of free RAM and disk space.
|
|
|
-
|
|
|
-``--chunker-params=19,23,21,4095`` (default) results in a coarse-grained
|
|
|
-deduplication and creates a much smaller amount of chunks and thus uses less
|
|
|
-resources. This is good for relatively big data volumes and if the machine has
|
|
|
-a relatively low amount of free RAM and disk space.
|
|
|
-
|
|
|
-If you already have made some archives in a repository and you then change
|
|
|
-chunker params, this of course impacts deduplication as the chunks will be
|
|
|
-cut differently.
|
|
|
-
|
|
|
-In the worst case (all files are big and were touched in between backups), this
|
|
|
-will store all content into the repository again.
|
|
|
-
|
|
|
-Usually, it is not that bad though:
|
|
|
-
|
|
|
-- usually most files are not touched, so it will just re-use the old chunks
|
|
|
- it already has in the repo
|
|
|
-- files smaller than the (both old and new) minimum chunksize result in only
|
|
|
- one chunk anyway, so the resulting chunks are same and deduplication will apply
|
|
|
-
|
|
|
-If you switch chunker params to save resources for an existing repo that
|
|
|
-already has some backup archives, you will see an increasing effect over time,
|
|
|
-when more and more files have been touched and stored again using the bigger
|
|
|
-chunksize **and** all references to the smaller older chunks have been removed
|
|
|
-(by deleting / pruning archives).
|
|
|
-
|
|
|
-If you want to see an immediate big effect on resource usage, you better start
|
|
|
-a new repository when changing chunker params.
|
|
|
-
|
|
|
-For more details, see :ref:`chunker_details`.
|
|
|
-
|
|
|
-
|
|
|
---umask
|
|
|
-~~~~~~~
|
|
|
-
|
|
|
-If you use ``--umask``, make sure that all repository-modifying borg commands
|
|
|
-(create, delete, prune) that access the repository in question use the same
|
|
|
-``--umask`` value.
|
|
|
-
|
|
|
-If multiple machines access the same repository, this should hold true for all
|
|
|
-of them.
|
|
|
-
|
|
|
---read-special
|
|
|
-~~~~~~~~~~~~~~
|
|
|
-
|
|
|
-The --read-special option is special - you do not want to use it for normal
|
|
|
-full-filesystem backups, but rather after carefully picking some targets for it.
|
|
|
-
|
|
|
-The option ``--read-special`` triggers special treatment for block and char
|
|
|
-device files as well as FIFOs. Instead of storing them as such a device (or
|
|
|
-FIFO), they will get opened, their content will be read and in the backup
|
|
|
-archive they will show up like a regular file.
|
|
|
-
|
|
|
-Symlinks will also get special treatment if (and only if) they point to such
|
|
|
-a special file: instead of storing them as a symlink, the target special file
|
|
|
-will get processed as described above.
|
|
|
-
|
|
|
-One intended use case of this is backing up the contents of one or multiple
|
|
|
-block devices, like e.g. LVM snapshots or inactive LVs or disk partitions.
|
|
|
-
|
|
|
-You need to be careful about what you include when using ``--read-special``,
|
|
|
-e.g. if you include ``/dev/zero``, your backup will never terminate.
|
|
|
-
|
|
|
-Restoring such files' content is currently only supported one at a time via
|
|
|
-``--stdout`` option (and you have to redirect stdout to where ever it shall go,
|
|
|
-maybe directly into an existing device file of your choice or indirectly via
|
|
|
-``dd``).
|
|
|
-
|
|
|
-To some extent, mounting a backup archive with the backups of special files
|
|
|
-via ``borg mount`` and then loop-mounting the image files from inside the mount
|
|
|
-point will work. If you plan to access a lot of data in there, it likely will
|
|
|
-scale and perform better if you do not work via the FUSE mount.
|
|
|
-
|
|
|
-Example
|
|
|
-+++++++
|
|
|
-
|
|
|
-Imagine you have made some snapshots of logical volumes (LVs) you want to backup.
|
|
|
-
|
|
|
-.. note::
|
|
|
-
|
|
|
- For some scenarios, this is a good method to get "crash-like" consistency
|
|
|
- (I call it crash-like because it is the same as you would get if you just
|
|
|
- hit the reset button or your machine would abrubtly and completely crash).
|
|
|
- This is better than no consistency at all and a good method for some use
|
|
|
- cases, but likely not good enough if you have databases running.
|
|
|
-
|
|
|
-Then you create a backup archive of all these snapshots. The backup process will
|
|
|
-see a "frozen" state of the logical volumes, while the processes working in the
|
|
|
-original volumes continue changing the data stored there.
|
|
|
-
|
|
|
-You also add the output of ``lvdisplay`` to your backup, so you can see the LV
|
|
|
-sizes in case you ever need to recreate and restore them.
|
|
|
-
|
|
|
-After the backup has completed, you remove the snapshots again. ::
|
|
|
-
|
|
|
- $ # create snapshots here
|
|
|
- $ lvdisplay > lvdisplay.txt
|
|
|
- $ borg create --read-special /path/to/repo::arch lvdisplay.txt /dev/vg0/*-snapshot
|
|
|
- $ # remove snapshots here
|
|
|
-
|
|
|
-Now, let's see how to restore some LVs from such a backup. ::
|
|
|
-
|
|
|
- $ borg extract /path/to/repo::arch lvdisplay.txt
|
|
|
- $ # create empty LVs with correct sizes here (look into lvdisplay.txt).
|
|
|
- $ # we assume that you created an empty root and home LV and overwrite it now:
|
|
|
- $ borg extract --stdout /path/to/repo::arch dev/vg0/root-snapshot > /dev/vg0/root
|
|
|
- $ borg extract --stdout /path/to/repo::arch dev/vg0/home-snapshot > /dev/vg0/home
|
|
|
-
|
|
|
-
|
|
|
-.. _append_only_mode:
|
|
|
-
|
|
|
-Append-only mode
|
|
|
-~~~~~~~~~~~~~~~~
|
|
|
-
|
|
|
-A repository can be made "append-only", which means that Borg will never overwrite or
|
|
|
-delete committed data (append-only refers to the segment files, but borg will also
|
|
|
-reject to delete the repository completely). This is useful for scenarios where a
|
|
|
-backup client machine backups remotely to a backup server using ``borg serve``, since
|
|
|
-a hacked client machine cannot delete backups on the server permanently.
|
|
|
-
|
|
|
-To activate append-only mode, edit the repository ``config`` file and add a line
|
|
|
-``append_only=1`` to the ``[repository]`` section (or edit the line if it exists).
|
|
|
-
|
|
|
-In append-only mode Borg will create a transaction log in the ``transactions`` file,
|
|
|
-where each line is a transaction and a UTC timestamp.
|
|
|
-
|
|
|
-In addition, ``borg serve`` can act as if a repository is in append-only mode with
|
|
|
-its option ``--append-only``. This can be very useful for fine-tuning access control
|
|
|
-in ``.ssh/authorized_keys`` ::
|
|
|
-
|
|
|
- command="borg serve --append-only ..." ssh-rsa <key used for not-always-trustable backup clients>
|
|
|
- command="borg serve ..." ssh-rsa <key used for backup management>
|
|
|
-
|
|
|
-Running ``borg init`` via a ``borg serve --append-only`` server will *not* create
|
|
|
-an append-only repository. Running ``borg init --append-only`` creates an append-only
|
|
|
-repository regardless of server settings.
|
|
|
-
|
|
|
-Example
|
|
|
-+++++++
|
|
|
-
|
|
|
-Suppose an attacker remotely deleted all backups, but your repository was in append-only
|
|
|
-mode. A transaction log in this situation might look like this: ::
|
|
|
-
|
|
|
- transaction 1, UTC time 2016-03-31T15:53:27.383532
|
|
|
- transaction 5, UTC time 2016-03-31T15:53:52.588922
|
|
|
- transaction 11, UTC time 2016-03-31T15:54:23.887256
|
|
|
- transaction 12, UTC time 2016-03-31T15:55:54.022540
|
|
|
- transaction 13, UTC time 2016-03-31T15:55:55.472564
|
|
|
-
|
|
|
-From your security logs you conclude the attacker gained access at 15:54:00 and all
|
|
|
-the backups where deleted or replaced by compromised backups. From the log you know
|
|
|
-that transactions 11 and later are compromised. Note that the transaction ID is the
|
|
|
-name of the *last* file in the transaction. For example, transaction 11 spans files 6
|
|
|
-to 11.
|
|
|
-
|
|
|
-In a real attack you'll likely want to keep the compromised repository
|
|
|
-intact to analyze what the attacker tried to achieve. It's also a good idea to make this
|
|
|
-copy just in case something goes wrong during the recovery. Since recovery is done by
|
|
|
-deleting some files, a hard link copy (``cp -al``) is sufficient.
|
|
|
-
|
|
|
-The first step to reset the repository to transaction 5, the last uncompromised transaction,
|
|
|
-is to remove the ``hints.N`` and ``index.N`` files in the repository (these two files are
|
|
|
-always expendable). In this example N is 13.
|
|
|
-
|
|
|
-Then remove or move all segment files from the segment directories in ``data/`` starting
|
|
|
-with file 6::
|
|
|
-
|
|
|
- rm data/**/{6..13}
|
|
|
-
|
|
|
-That's all to it.
|
|
|
-
|
|
|
-Drawbacks
|
|
|
-+++++++++
|
|
|
-
|
|
|
-As data is only appended, and nothing removed, commands like ``prune`` or ``delete``
|
|
|
-won't free disk space, they merely tag data as deleted in a new transaction.
|
|
|
-
|
|
|
-Be aware that as soon as you write to the repo in non-append-only mode (e.g. prune,
|
|
|
-delete or create archives from an admin machine), it will remove the deleted objects
|
|
|
-permanently (including the ones that were already marked as deleted, but not removed,
|
|
|
-in append-only mode).
|
|
|
-
|
|
|
-Note that you can go back-and-forth between normal and append-only operation by editing
|
|
|
-the configuration file, it's not a "one way trip".
|
|
|
-
|
|
|
-Further considerations
|
|
|
-++++++++++++++++++++++
|
|
|
-
|
|
|
-Append-only mode is not respected by tools other than Borg. ``rm`` still works on the
|
|
|
-repository. Make sure that backup client machines only get to access the repository via
|
|
|
-``borg serve``.
|
|
|
-
|
|
|
-Ensure that no remote access is possible if the repository is temporarily set to normal mode
|
|
|
-for e.g. regular pruning.
|
|
|
-
|
|
|
-Further protections can be implemented, but are outside of Borg's scope. For example,
|
|
|
-file system snapshots or wrapping ``borg serve`` to set special permissions or ACLs on
|
|
|
-new data files.
|
|
|
-
|
|
|
-SSH batch mode
|
|
|
-~~~~~~~~~~~~~~
|
|
|
-
|
|
|
-When running |project_name| using an automated script, ``ssh`` might still ask for a password,
|
|
|
-even if there is an SSH key for the target server. Use this to make scripts more robust::
|
|
|
-
|
|
|
- export BORG_RSH='ssh -oBatchMode=yes'
|
|
|
+.. raw:: html
|
|
|
+ Redirecting...
|
|
|
+
|
|
|
+ <script type="text/javascript">
|
|
|
+ // Fixes old links which were just anchors
|
|
|
+ var hash = window.location.hash.substring(1);
|
|
|
+
|
|
|
+ // usage.html is empty, no content. Purely serves to implement a "correct" toctree
|
|
|
+ // due to rST/Sphinx limitations. Refer to https://github.com/sphinx-doc/sphinx/pull/3622
|
|
|
+
|
|
|
+ // Redirect to general docs
|
|
|
+ if(hash == "") {
|
|
|
+ window.location.pathname = window.location.pathname.replace("usage.html", "usage/general.html");
|
|
|
+ }
|
|
|
+ // Fixup anchored links from when usage.html contained all the commands
|
|
|
+ else if(hash.startsWith("borg-key") || hash == "borg-change-passphrase") {
|
|
|
+ window.location.hash = "";
|
|
|
+ window.location.pathname = window.location.pathname.replace("usage.html", "usage/key.html");
|
|
|
+ }
|
|
|
+ else if(hash.startsWith("borg-")) {
|
|
|
+ window.location.hash = "";
|
|
|
+ window.location.pathname = window.location.pathname.replace("usage.html", "usage/") + hash.substr(5) + ".html";
|
|
|
+ }
|
|
|
+ </script>
|
|
|
+
|
|
|
+.. toctree::
|
|
|
+ :hidden:
|
|
|
+
|
|
|
+ usage/general
|
|
|
+
|
|
|
+ usage/init
|
|
|
+ usage/create
|
|
|
+ usage/extract
|
|
|
+ usage/check
|
|
|
+ usage/rename
|
|
|
+ usage/list
|
|
|
+ usage/diff
|
|
|
+ usage/delete
|
|
|
+ usage/prune
|
|
|
+ usage/info
|
|
|
+ usage/mount
|
|
|
+ usage/key
|
|
|
+ usage/upgrade
|
|
|
+ usage/recreate
|
|
|
+ usage/tar
|
|
|
+ usage/serve
|
|
|
+ usage/lock
|
|
|
+ usage/benchmark
|
|
|
+
|
|
|
+ usage/help
|
|
|
+ usage/debug
|
|
|
+ usage/notes
|
enkore