Why do you need to back up that server data? The great thing about joplin, is that the full content of your notes (and history) is distributed, like a git repo. As long as you have one device left with your notes, everything else can be bootstrapped from there. If your sync server burns down, start a new one and sync your notes to it again.

I’ve been very happy with roku tvs at home and a roku stick “to-go”. Very simple interface with minimal ads that you can block.

firefox sync has worked pretty great for me, across all devices. I don’t self host it, but seems like once again, they’ve gotten it to the point where you can.