Yep. Would be pretty bad software otherwise. Best to set it up so it keeps one monthly, one weekly, and 2-3 daily snapshots. Then you don’t even need to think about it, and it deletes older ones automatically. You can still do manual snapshots, and it won’t delete those.
Springtails? You can test by seeing if they jump away from you.
If so, I think they only eat dead stuff. But I also heard they can sometimes chew on roots (and there are a lot of them here…)