You would leave your plex config and db files on the disk and then map them into the docker container via the volume parameter (-v parameter if you are running command line and not docker-compose). Same goes for any other docker container where you want to persist data on the drive.

I wouldn’t trust him with anything at all

I remember going from a 2 minute boot time to under 40s on windows. That was all the convincing I needed

How so? And regular or OLED version?

I think you’re barking up the wrong tree. It’s kind of the whole point of this community