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- .. _faq:
- .. include:: global.rst.inc
- Frequently asked questions
- ==========================
- Which platforms are supported?
- Currently Linux, FreeBSD and MacOS X are supported.
- Can I backup VM disk images?
- Yes, the :ref:`deduplication <deduplication_def>` technique used by |project_name|
- makes sure only the modified parts of the file are stored.
- Which file attributes are preserved?
- The following attributes are preserved:
- * Name
- * Contents
- * Hardlinks and symlinks
- * Time of last modification (nanosecond precision with Python >= 3.3)
- * User ID of owner
- * Group ID of owner
- * Unix Permission
- * Extended attributes (xattrs)
- * Access Control Lists (ACL_) on Linux, OS X and FreeBSD
- * BSD flags on OS X and FreeBSD
- How can I specify the encryption passphrase programmatically?
- The encryption passphrase can be specified programmatically using the
- `ATTIC_PASSPHRASE` environment variable. This is convenient when setting up
- automated encrypted backups. Another option is to use
- key file based encryption with a blank passphrase. See
- :ref:`encrypted_repos` for more details.
- When backing up to remote servers, is data encrypted before leaving the local machine, or do I have to trust that the remote server isn't malicious?
- Yes, everything is encrypted before leaving the local machine.
- If a backup stops mid-way, does the already-backed-up data stay there? I.e. does Attic resume backups?
- Yes, during a backup a special checkpoint archive named ``<archive-name>.snapshot`` is saved every 5 minutes
- containing all the data backed-up until that point. This means that at most 5 minutes worth of data needs to be
- retransmitted if a backup needs to be restarted.
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