Currently, your game data is stored online in a cloud server to enable multiplayer. Unfortunately, there is no backup system available. This means that if you switch devices or uninstall the app, all your game progress could be lost.
Your Magic Brick Wars data is also tied to your Halfbrick+ account, so if you lose access to, or delete, the account, you will also lose your Magic Brick Wars progression.
Magic Brick Wars does not connect to Google Play Games or Game Center.