problem with time machine after OS upgrade

I just updated my iMac from OS Maverick to High Sierra. It all seemed to go well. I was using Time Machine with no encryption on Maverick, and disconnected the external HD while I did the OS update. Then I reconnected the external HD. Time Machine gave this error message when I asked it to back up:

"Time Machine did not back up because the backup disk was previously encrypted but is no longer encrypted." But the backup disk was NOT previously encrypted so far as I know.

Posted on Feb 14, 2021 10:09 PM

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problem with time machine after OS upgrade

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