The file I was trying to restore was an excel spreadsheet. I checked the event logs in Bacup Exec and in event viewer, no errors shown.
Tried another file as well, still no joy.
Completed the update to 9.1 and rebooted the server. Now Device and Media service will not start, returns the error 2077, service hangs after trying to start (Source: Service Control Manager). Have tried teh solution of delaying the startup of this service, but again no luck.