Backup
adb backup -noapk com.your.packagename
There will be a "x.ab" file
Restore
adb restore backup.ab
This can be used for moving data from legacy app that does not have any cloud function to new device.
Android apps data can be moved around without root access using adb: https://stackoverflow.com/questions/13006315/how-to-access-data-data-folder-in-android-device