if any thing id copy your diablo 3 files onto a usb (saves your chars and such) to save that half its pretty easy and can be found on youtube, the other the game in general should automatically swap over once u deactivate and make it your main like Psn said long as you log onto your main account on it. other game saves may be effected if u have alot of others fallout4, skyrim w.e that u may need to backup too if u dont wanna lose that data. but idk havent messed with it much besides going from ps3 to a ps4 then to another ps4 idk about the new model if that will let you do the same things which im sure it would