I’m not too fimiliar with Galaxy or Android for that matter, but if your tablet came with software that manages Backup and Restore. All you would need to do is perform a full backup for your device to your computer. Disconnect it after it has been backed up. Do a factory reset to return it to “new”.
When you get another compatible device, just sync it with your computer and restore. All your previous settings/data should move to your new device (phone/tablet, etc.).
Someone posted this at an Android discussion forum, it might also be worth a shot;
In any case, I’d practice caution if the data is important to you.