It’s tough when the directions leave out making a folder outside of the container to store configs. That’s burned me once.

It seems to be step #3 here jellyfin.org/docs/general/…/container/

I’m not looking to update a single container but a single project’s container; just because I want to update project A’s containers doesn’t mean I also want to update project B’a containers. The only instructions I’ve found update all projects at the same time.

If you’re using docker compose, put them into a different compose file. Then you can manage them separately.

I’m not so worried about the config files as I am worried about backing up the data inside the containers being created from data outside the containers.

Data inside the containers? All the important and necessary data should be outside of them. That’s sorta one of the big points. You shouldn’t have anything changing inside them.