[notpushkin]

> If the user is already using a Google Account for the app (you need a google account to officially download apps from the Play store), they are okay with minimal use of the Google account.

I'm using an unofficial Google Play client, Aurora Store, which can use anonymous accounts instead of your own account.

Anyway, giving the user an option to backup data in Google is better than no option at all, although I'd also add a simple export to file, too.