Here is a migration guide from the devs: https://docs.seerr.dev/migration-guide

How did you install Overseerr in CasaOS?

If I understand it, Docker users just need to update the compose file and the settings should migrate. But I haven’t done this yet and I’ll definitely be backing up first.

I use metube and Pinchflat.

Metube is great for one-off video downloads and works for many sites including social media. This comes in handy a lot when I want to send a short reel to friends without linking to Facebook, etc.

Pinchflat automatically downloads my favorites playlists and a couple other channels that I follow. These videos go into specific folders that are linked to Plex libraries.