[Borgbackup] Is ~100 MiB of new data OK for unchanged large image files?

[Thomas Waldmann]

> In case of repeated backup calls without any changes
> to the image, the image gets rechunked, but not too much data added to
> the repo. This is exactly how documented in the FAQ already:
> 
> https://borgbackup.readthedocs.io/en/stable/faq.html#why-is-backup-slow-for-me

Yeah and especially the following entry might be relevant if it rechunks 
the qcow2 file without the qcow2 being modified:

https://borgbackup.readthedocs.io/en/stable/faq.html#i-am-seeing-a-added-status-for-an-unchanged-file

> Though, Borg does create some new chunks of data which are pretty much
> ~100 MiB each for each execution of Borg without any changes.

Sounds a bit much for no-change (would expect < 1MB) - can you open a 
github issue for this and give all info + script to reproduce it?

Did you start the VM that uses this qcow2 image in between the borg 
create runs?

Cheers, Thomas

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