I feel your pain 😅🫠

Yeah, just to add another confirmation to the other comments, if you have a separate home partition you can reuse it with a new / partition and expect it to work fine. The only stuff that gets saved in your home folder is comfiguration files for your apps, along with whatever actual files you have stored. You can even swap distros (Ubuntu/Arch) and keep your home folder, though sometimes the config files and settings don’t translate perfectly.

Sadly it doesn’t 🥲. Copying app data is the hardest part of the process without a system level backup like seedvault, neobackup or traditional google backup services.

Only if you’re currently running stock android.

NeoBackup is the only one I’ve run across that seems to really fill the role of backup and restore thoroughly. The trouble is, in order to work it needs root, so I’ve never actually been able to try it. Almost reason enough to root in my book 😅, I love a good back up system.

Seedvault is another fairly well developed option, but it needs to be hardcoded in to the OS by the ROM developer.

You’ll probably benefit from a series of different backup apps in combination. Here’s a few that I’ve used and benefited from:

SMS import/export - backs up all SMS, MMS, call logs and contacts. Does not backup RCS.

Applist backup - back up your installed app list. This includes data on where you installed the app from and where you can get it again along with other useful info. The apps still have to manually installed.

Aside from those two, most FOSS apps include a backup and restore function, such as: signal, neo launcher, fossify calendar, newpipe, metro (music player), aegis (2 factor), obtainium, etc…

I hope this helps. I tend to tinker and install various ROMs, so am well aquainted with the pain of setting up a fresh OS without a system wide backup program. Its not as bad as it seems though, and as long as you get your messages, contacts and call logs moved over it goes pretty smooth.

I do see a mention in that post about instead supporting the jellyfin client developers. They give this page as a reference for who to support based on which client you use.