Power Surge Upset SuperDuper!
Thanks, Dave. That bit of info about which drive was running the program did it. I opened "About this Mac" and it was the backup disc running. I have no idea how that happened - but it did. I was able to reboot using the MacHD and then the backup disc was again visible in SD. It is backing up the system as we speak.
Thank you very much for your help.
David
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