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- File systems
- ~~~~~~~~~~~~
- We strongly recommend against using Borg (or any other database-like
- software) on non-journaling file systems like FAT, since it is not
- possible to assume any consistency in case of power failures (or a
- sudden disconnect of an external drive or similar failures).
- While Borg uses a data store that is resilient against these failures
- when used on journaling file systems, it is not possible to guarantee
- this with some hardware -- independent of the software used. We don't
- know a list of affected hardware.
- If you are suspicious whether your Borg repository is still consistent
- and readable after one of the failures mentioned above occurred, run
- ``borg check --verify-data`` to make sure it is consistent.
- .. rubric:: Requirements for Borg repository file systems
- - Long file names
- - At least three directory levels with short names
- - Typically, file sizes up to a few hundred MB.
- Large repositories may require large files (>2 GB).
- - Up to 1000 files per directory.
- - rename(2) / MoveFile(Ex) should work as specified, i.e. on the same file system
- it should be a move (not a copy) operation, and in case of a directory
- it should fail if the destination exists and is not an empty directory,
- since this is used for locking.
- - Hardlinks are needed for :ref:`borg_upgrade` (if ``--inplace`` option is not used).
- Also hardlinks are used for more safe and secure file updating (e.g. of the repo
- config file), but the code tries to work also if hardlinks are not supported.
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