Seconding this. I recommend OMV if you’re new or inexperienced with Linux and self hosting. I started my server when it was a gaming PC running Windows and OMV has felt like an easy transition for me.

But Docker is all but required in my opinion. I like working with Docker Compose files and I keep OMV on a separate drive in case I want to move to pure Debian or other distro.

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.