Re: backup on volume much larger than fileset

Hi Rob, all,

Am 18.03.2026 um 17:11 schrieb Rob Gerber:
> I have a thought, which Arno may have already had:
> 
> What if the difference between the sizes reported by 'du -sh' and Bacula 
> is due to block-level deduplication by Btrfs?

It's partly that, indeed.

However, the actual question seems to be answered, so we'll probably not 
get more real-life insight into how btrfs reports occupation and 
considers-or-not deduplicated, shared data :-)

>... 
> With that said, this documentation states that btrfs implements only 
> offline after-the-fact deduplication. So something would have to run 
> periodically to de-duplicate your filesystem. Of course, some default 
> configuration wizard could have set up such a process for you, without 
> your knowledge.

Good point. Also a good point to consider hidden defaults ;-)

Cheers,

Arno


-- 
Arno Lehmann

IT-Service Lehmann
Sandstr. 6, 49080 Osnabrück



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