backup needs much more space than the LXC itself

[fruchtzwerg]

I have a lxc container in pve. The webgui shows me an amount of storage of 12.69 GB.


The backup in PBS needs more than 20GB.

I cannot afford this amount of storage and would like to shrink the storage of the backup.
But how?

 

[Impact]

Can you check if it gets smaller if you call pct fstrim CTIDHERE first? Maybe some files change very often or there's some sparse files or something.