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.. _faq:
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.. include:: global.rst.inc
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Frequently asked questions
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==========================
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Which platforms are supported?
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2013-07-31 18:51:01 +00:00
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Currently Linux, FreeBSD and MacOS X are supported.
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2013-06-29 21:56:44 +00:00
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Can I backup VM disk images?
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2013-07-31 18:51:01 +00:00
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Yes, the :ref:`deduplication <deduplication_def>` technique used by |project_name|
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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
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* Contents
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* Time of last modification (nanosecond precision with Python >= 3.3)
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* User ID of owner
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* Group ID of owner
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* Unix Permission
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* Extended attributes (xattrs)
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2013-07-31 18:51:01 +00:00
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.. Note::
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POSIX Access Control Lists (ACL_) are not yet preserved.
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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
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`ATTIC_PASSPHRASE` environment variable. This is convenient when setting up
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automated encrypted backups. Another option is to use
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key file based encryption with a blank passphrase. See
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:ref:`encrypted_repos` for more details.
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