"Time Machine Backup Not Completed"
Has anyone encountered their Time Machine not continuing to backup?
After a restart everything works fine and will back up on the hour for a few sessions. Then after the computer goes into a power nap, or sleep overnight, the next time I wake it up I get the "Time Machine Backup Not Completed" notice. It doesn't respond to the "Back Up Now" command either. If I restart the computer, it will start backing up again until it naps or sleep.
I've erased, reformatted and reconnected the backup disk to time machine last week; no change to the situation. My power saving settings have power nap enabled. This problem started after I updated to Big Sur 11.6 on an iMac (Retina 4K, 21.5-inch, 2017). I also ran first aid on the backup drive and it is fine with no errors.
Any suggestions to this problem would be appreciated.