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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
  • 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>.checkpoint 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.