Scan and Pin uses a local database for storing encrypted data. You should schedule a routine to backup this data regularly.
To begin, you can choose to backup the entire installation folder or just the database folder.
These are stored in c:\program files\scan and pin (or your install path).
Copy the entire contents to a ZIP file or USB / Network drive and date the folder. The copy should be on a different physical medium than the original, for example a different hard disk or computer.
Ensuring you backup your data will make it simple to re-install should the worst happen.