How to Verify External HD Time Machine Backup.
I want to verify a time machine backup on an external drive to my iMac hd. The Apple support page says to press the option key after opening Time Machine. However, nothing happens and that option does not work. Using the terminal cmd of "tmutil compare –s" does not find a path to the external hd.
How can I verify a time machine backup on an external hd to my iMac that is on macOS Big Sur?
iMac