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.. _faq:
.. include:: global.rst.inc
Frequently asked questions
==========================
Which platforms are supported?
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Currently Linux, FreeBSD and MacOS X are supported.
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Can I backup VM disk images?
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Yes, the :ref:`deduplication <deduplication_def>` technique used by |project_name|
makes sure only the modified parts of the file are stored.
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Which file attributes are preserved?
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The following attributes are preserved:
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* Name
* Contents
* Hardlinks and symlinks
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* 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
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How can I specify the encryption passphrase programmatically?
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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.