Mounted external disk, Time machine can't 'see' it.
I am trying to back up on time machine to my external ssd hard drive.
I get a message, 'Back up disk not available, Try backing up again when the external HD is available.'
I've run first aid. It is a USB A.
My main internal HD is partitioned. I don't know if that could be an issue. I only want to copy 1 partition, the main HD. The external HD is not partitioned.
I tried 'Restore' with my main drive, unmounted, remounted and rebooted the machine and that failed as well.
Thank you
Mac Studio