"Access is denied" errors occur when attempting to backup SQL Databases
V-79-57344-33938 - BackupVirtualDeviceSet::Initialize: CoCreateInstance failure on backup device ''. Operating system error 0x80070005 (Access is denied.)
V-79-65323-18210 - BackupVirtualDeviceSet::Initialize: CoCreateInstance failure on backup device ''. Operating system error
This error may occur if multiple SQL instances exist on the same server and the SQL services for these instances are running under different service accounts. For instance, the SQL Server service is running under the Local System account for one instance and another SQL service on the same server is running under a domain administrator account.