I get that type of an indication when a USB drive has not been properly identified and integrated into the system. A stop/start on the drive usually solves the problem.
"Stop the Norton Ghost service.Delete the hidden VProRecovery folder and it's contents.Restart the Norton Ghost service or reboot" - OK done
"Does the drive still show as a destination?" - Unfortunately yes
"Can you right click and ignore now?" - To overcome the exclamation mark problem I transferred sufficient files to another drive but of course it is now showing clearly as one of two Backup Destination Drive as per the screen shot.
How do I stop G: drive being referred to as a backup destination? (I can change the drive letter which seems to work but would prefer not to do it that way).
Would starting fresh by reinstalling the Program help?