If you use iCloud synchronization, your notes are backup up automatically in iCloud and will be downloaded on the first launch of a new device.
In addition, you can use the backup functionality of your device to create a copy of SnipNotes’ data:
Back up your device as usual via iCloud or iTunes. This backup contains the data of all your installed apps, including SnipNotes.
Create a copy of SnipNotes’ data folders with Time Machine or another backup utility:
The second path contains a subfolder “database”. The file “SnipNotes.realm” stores all your notes and can be viewed with the free tool Realm Browser.
Notice: When you restore a local backup, you may have to reset the iCloud synchronization.