Yeah happened to me. Got temp banned for trash talking, then went on an alt and then got perma'd. It is what it is but I spend much less time on there as a result. Win win?

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.