The error reported in Windows Event Viewer of the source server during file system + system state backup.
"The description for Event ID 65535 from source ASIGRA VSS Initiator cannot be found. Either the component that raises this event is not installed on your local computer or the installation is corrupt. You can install or repair the component on the local computer. If the event originated on another computer, the display information had to be saved with the event"
Trend Micro Security Software was installed on the server.
Backup ran without error after disable Trend Micro.