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Really depends on the make, you can get Mitchell and AllData prior to the subscription model (takes about a TB of space, from 1980s to 2013) to help with diagrams and disassembly and reassembly. Mitchell’s wiring diagrams really are a lifesaver.
Dealer level software/scanner combo you can get from obdii365, I got a Hyundai scanner from them and it worked well but you want to run the software in a VM or isolate it some other way and probably wouldn’t network it.
Vxdiag is pretty solid as well for the dealer software/scanner and you can usually get via Amazon but again I wouldn’t trust the software. I have their ford one and used it with IDS to set the VIN on an electronic power steering rack.
The software itself you can find via Google if it’s all you need but typically the scanner is very specific to the software for the dealership stuff
I just use nextcloud as a target for backups (Aegis, Signal, QkSMS). Apps such as KeePassDX I have load the file via nextcloud. My contacts and calendar go through it as well, photos are just set to auto upload along with a few other directories.
As for the home screen layouts, I just take screenshots once I have it how I like and try to remember to take them again if I change stuff.
It’s not a full backup but I’m back up and running fairly quickly (Pixel 5A died on me 3 times in under a one year lifespan per device).