I run Adguard Home containers (the primary auto-syncs to the secondary) and use redirect filters to assign hostnames to each of my containers. I have a "services" folder of bookmarks for each container host so I don't have to remember each service's port number. I use KeePassXC to track all my passwords and certificates so authentication is a breeze (someday I'll get around to setting up an SSO solution). I also keep a .txt file with my basic network info that doesn't always translate well to dns hostname redirects in adguard. I occassionally remember to update my hosts listed in the file. My individual config files aren't backed up beyond my automated container backups, but so far none of my services have been that complicated I couldn't just rebuild from scratch.
It's not perfect, but combined with my automated backups I have barely enough to rebuild if/when my hardware fails.
FinAmp is a fantastic JellyFin music player, and even supports offline downloads for on the road. Sadly the interface isn't really AndroidTV-friendly, but it works great on android touch screens, iOS, linux, and macOS (probably Windows too, but I'll never know).
I'm looking for a good AndroidTV player as well, because the official JellyFin app doesn't background well. We like to play music in parallel with a screensaver or fireplace app, but JellyFin pauses after about a minute when hackgrounded.