borg/docs/faq.rst

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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
* Time of last modification (nanosecond precision with Python >= 3.3)
* User ID of owner
* Group ID of owner
* Unix Permission
* Extended attributes (xattrs)
.. Note::
POSIX Access Control Lists (ACL_) are not yet preserved.
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.