[Borgbackup] borg adds same files every time

[Thomas Waldmann]

>> For change detection, borg does NOT use the atime (but ctime [default 
>> in borg 1.1+] or mtime [if you tell so]).
> 
> You're right, I forgot that the atime option has been removed from 
> newest version of borg.

That's yet another unrelated thing. The change detection is unrelated to 
what borg writes into an archive (by default).

> This means that adding a new file solved the 
> situation:
> https://borgbackup.readthedocs.io/en/stable/faq.html#i-am-seeing-a-added-status-for-an-unchanged-file 
 >
 > "If you want to avoid unnecessary chunking, just create or touch a small
 > or empty file in your backup source file set [...]"

Yup, that's it!
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