If you want to give a person instructions on how to cleanup backups, you can tell them that if a directory contains a file named box_xxx, then it's a full backup. Otherwise, it's not. In general, if you had backups for this year, you can safely remove everything from 2020 I guess. Alternately, the backend people must have some mechanism to stash those things in some other bucket temporarily instead of deleting it.
https://d2c.io is pretty decent. Not open-source but self-hosted and does clustering well. They have a Discord channel I nudged them to setup but it only gets a post every few months. Decent project though and some solid app-stacks packaged for one-click installs.
Update SickChill to v2021.03.18-1
Discord name, avatar, and tts were not saved to config. Fixes #7047
Manually set cloudscraper delay, avoid one more potential parse error
New Crowdin updates (#7048)
Network logo - Add Fox Kids (#7042)