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- Support for file metadata
- ~~~~~~~~~~~~~~~~~~~~~~~~~
- Besides regular file and directory structures, Borg can preserve
- * symlinks (stored as symlink, the symlink is not followed)
- * special files:
- * character and block device files (restored via mknod)
- * FIFOs ("named pipes")
- * special file *contents* can be backed up in ``--read-special`` mode.
- By default the metadata to create them with mknod(2), mkfifo(2) etc. is stored.
- * hardlinked regular files, devices, FIFOs (considering all items in the same archive)
- * timestamps in nanosecond precision: mtime, atime, ctime
- * other timestamps: birthtime (on platforms supporting it)
- * permissions:
- * IDs of owning user and owning group
- * names of owning user and owning group (if the IDs can be resolved)
- * Unix Mode/Permissions (u/g/o permissions, suid, sgid, sticky)
- On some platforms additional features are supported:
- .. Yes/No's are grouped by reason/mechanism/reference.
- +-------------------------+----------+-----------+------------+
- | Platform | ACLs | xattr | Flags |
- | | [#acls]_ | [#xattr]_ | [#flags]_ |
- +=========================+==========+===========+============+
- | Linux | Yes | Yes | Yes [1]_ |
- +-------------------------+----------+-----------+------------+
- | Mac OS X | Yes | Yes | Yes (all) |
- +-------------------------+----------+-----------+------------+
- | FreeBSD | Yes | Yes | Yes (all) |
- +-------------------------+----------+-----------+------------+
- | OpenBSD | n/a | n/a | Yes (all) |
- +-------------------------+----------+-----------+------------+
- | NetBSD | n/a | No [2]_ | Yes (all) |
- +-------------------------+----------+-----------+------------+
- | Solaris and derivatives | No [3]_ | No [3]_ | n/a |
- +-------------------------+----------+-----------+------------+
- | Windows (cygwin) | No [4]_ | No | No |
- +-------------------------+----------+-----------+------------+
- Other Unix-like operating systems may work as well, but have not been tested at all.
- Note that most of the platform-dependent features also depend on the file system.
- For example, ntfs-3g on Linux isn't able to convey NTFS ACLs.
- .. [1] Only "nodump", "immutable", "compressed" and "append" are supported.
- Feature request :issue:`618` for more flags.
- .. [2] Feature request :issue:`1332`
- .. [3] Feature request :issue:`1337`
- .. [4] Cygwin tries to map NTFS ACLs to permissions with varying degrees of success.
- .. [#acls] The native access control list mechanism of the OS. This normally limits access to
- non-native ACLs. For example, NTFS ACLs aren't completely accessible on Linux with ntfs-3g.
- .. [#xattr] extended attributes; key-value pairs attached to a file, mainly used by the OS.
- This includes resource forks on Mac OS X.
- .. [#flags] aka *BSD flags*. The Linux set of flags [1]_ is portable across platforms.
- The BSDs define additional flags.
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