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The external drive shows on the desktop, has been erased and formatted with extended (journaled), OS 14.7, but Time Machine just won't backup.
Sounds like you need to open the Time Machine settings and add the erased external drive.
You're welcome.
It's also a good idea to remove the other old erased backup drive from the list to prevent future confusion.
Thank you SO much. I did "add" it (even though it looked like it was already there), and bingo, that worked.
Time Machine shows disk not connected
