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@@ -357,6 +357,17 @@ to change them.
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Use ``borg repo-compress`` to efficiently recompress a complete repository.
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+Why is backing up an unmodified FAT filesystem slow on Linux?
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+-------------------------------------------------------------
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+
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+By default, the files cache used by BorgBackup considers the inode of files.
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+When an inode number changes compared to the last backup, it hashes the file
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+again. The ``vfat`` kernel driver does not produce stable inode numbers by
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+default. One way to achieve stable inode numbering is mounting the filesystem
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+using ``nfs=nostale_ro``. Doing so implies mounting the filesystem read-only.
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+Another option is to not consider inode numbers in the files cache by passing
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+``--files-cache=ctime,size``.
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+
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Security
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TW