You should have another partition for /srv (even on the same drive).
Otherwise schnapps backup will soon fill whole drive.
I have 16GB mSata with system and LXC with mysql, that collects lots of data. And few weeks after moving system to mSata, and having LXC on root partition, I ran out of space.
I had to remove schnapps backups, create subvolume for /srv, move data and it runs without issues for another few weeks…
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