Seaquel
SQL Server error code

SQL Server error 3206

SQL Server raises error 3206 at severity 16, which marks a problem with the query or data that you can correct.

Backup device '%.*ls' does not exist. To view existing backup devices, use the sys.backup_devices catalog view. To create a new backup device use either sp_addumpdevice or SQL Server Management Studio.
Msg3206
Severity16
Group3000–3999

Source: Database Engine events and errors