SQLBackup is an old project of mine from back in the Windows 2000 / SQL 7 days when backing up a database was a true pain and backup software (such as Backup Exec) were impossibly expensive for the common folk.
Please make no mistake, this application is not a viable backup solution but it does contain workable examples of the SQL Server virtual device interface (VDI).
Original blurb from the SQLBackup documentation: "SQLBackup is a powerful yet easy-to-use Microsoft SQL Server
protection and disaster recovery solution for any single computer. SQLBackup
makes it easy to conveniently back up important databases while you're not even
around, using the advanced scheduling system. SQLBackup makes it safe
and easy to protect against data loss."
...boy, I had a lot of undue confidence back then.