This question already has an answer here:
I want to buy a new android device and do not want to root it. But I need some functions. These functions can only be provided - on a non-rooted device if they are provided as system app.
So I end up with a quetion about which veendor provides me with system apps, providiing the needed functions (app-data backup, local contacts, local calendar and autostart-manager). Is this completely off topic here, or is there a stack-exchangee-site where this would be on topic?