Olivier Nicole wrote:

If I am not wrong, amanda needs to update some information on the
files it had backed-up, in order to keep track of what file are
changing or not since last back-up.

Yes, but not in the files or inodes itself.
That tracking info managed by amanda and is stored in the directory
you specified when compiling amanda (--with-gnutar-listdir=...),
probably ~/amanda/gnutar-lists.


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