Can I backup iPad data to a Child Apple Account?

Tom_Mech wrote:

I know, but that is not the question. Given the fact that all his games (and progress in those) are on the iPad now, linked to our family account, the question is if we can back that up and afterwards reset the iPad and log in with a newly created child account and use the backup to install again on the same device but with the child account.

Thanks,

Consider that an AppleID is intended to be used by a specific individual. An AppleID that is shared offers no separation between users or their data - and in sharing an AppleID, runs the risk of personal and sensitive data being unintentionally shared between users.

An AppleID account is intended to be used by a single user for life.

Assuming that you accept the implications of using an entirely different AppleID account - what you propose, while not necessarily recommended, is indeed possible...

Change AppleID Account

If you do wish to change and use an entirely different AppleID, first ensure that you have disabled the Activation Lock that will otherwise cause difficulties in the future. You can disable the Activation Lock by disabling the Find My service from iPad/iPhone settings before trying to use a different AppleID account:

Settings > [Your Name / AppleID] > Find My > Find My iPad - set to OFF

Having disabled the Activation lock, you can now sign-out from your old AppleID:

Settings > [Your Name / AppleID] > Sign Out

Presumably you’ll want to keep any iCloud data that is locally stored on your iPad. If so, accept the opportunity to keep a local copy of your data (e.g., Calendar, Contacts, Notes, Keychain Passwords etc.) - as otherwise this data will be wiped from your iPad as you sign-out from iCloud. 

Also ensure that you have signed-out from Messages and FaceTime:

• Settings > Messages > Send and Receive > [AppleID] - scroll to the bottom where you will find your signed-in AppleID highlighted in blue text; tap and select Sign Out

• Settings > FaceTime > [AppleID] - again, scroll down the page to find your signed-in AppleID highlighted in blue text; tap and select Sign Out

After signing out, a restart of your iPad is recommended:

Restart your iPad - Apple Support

After restarting, you can sign-in to your new AppleID account from iPad settings - and also sign-in to Messages and FaceTime if necessary. Any iCloud data that you saved to your device during the previous sign-out will be irreversibly merged with your new AppleID account.

you should be able to add screentime restrictions on a device using a child account.

all app data is tied to the apple account and can not be transferred to another apple account