Only two options. The phones in-built backup manager, smart switch works well. That’s not what you want though. Android emulator, replicate as near as possible. Problem is I fear you’ll need that number to be kept activated and whatever cloud service on the phone to keep going.

Thanks. Learning quite a lot since I had the idea to do it with my old machine.

How will truenas limit me?

I’ve tried Ubuntu before, mint and debian. I prefer their security and interface. I don’t want the hassle of Windows being on that machine with constant updates and all that useless crap that comes with it.