For our app, DLS 20, you will need to either link your game profile to Facebook or use the new "Sign in with Apple" option (iOS only - 13.0+ required) in order to backup or transfer your save data to other devices.
For our apps, Score! Match and 8 Ball Hero, you will need to link your game profile to Facebook in order to backup or transfer your save data to other devices.
For our apps, Score! Hero and Dream League Soccer (19), you can only use iCloud (if you are on iOS) or Google Play Saved Games (if you are on Android) to store and restore your existing save data. Save data and in-app purchases cannot be transferred across platforms e.g. Android to iOS or vice versa. It is worth noting as well that signing into the social networking sites such as Facebook or Game Center on Score! Hero or Dream League Soccer is merely to allow scores and achievements to be uploaded, but no actual save data is stored there.
Further information for Google Play Saved Games:
Further information for iCloud: