Help Appreciated. My wife has taken delivery of a new MB Air M1 enabled and it is truly great. But it couldn’t seem to back up to my existing Apple Time Capsule. So I did some reading and it seems (depending who you listen to) that Time Capsule needs to be formatted to APFS and others, including Apple, say that Time Machine will update HFS+ automatically. That will enable existing time machine backups to continue to be useful for anyone upgrading to BS.
So I upgraded my beloved 2015 MBP. Now neither of us can get TM to back up to the Time Capsule.
So, I erased the TC and rebooted it, thinking that either computer would offer to reformat the drive to APFS when commencing a brand new backup.
NO luck. All I get is this, and no further explanation as to what may be the problem or the solution.