Back up failed Time Machine couldn't back up to "My Passport for Mac"

Portable Drives My Passport
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Back up failed Time Machine couldn’t back up to “My Passport for Mac”

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Hi,

You could refer to the following link: Why Initial macOS Time Machine Backup Fail?

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Have looked at the link and it refers to the initial backup. It has been backing up pretty uneventfully for a couple of years (or so - can’t give an exact date) except for one occasion that cured itself when I just rebooted the computer. Can’t recall if the error message was the same or not, but tried the re-boot this time and it hasn’t helped. I have now turned off the screen save and power save options. I use a mac mini running macOSCatalina 10.15.7. Cheers