Time machine backup error 19
I have been using Time Machine to backup my iMac for years. However, I recently upgraded the IOS to Monterey and I have noticed Time Machine is no longer backing up. It takes a long time “preparing backup” and then it reports “The backup disk image …sparsebundle could not be accessed (error 19).” Time Machine can see the backup disk, and the NAS is accessible through the finder. Please help.
iMac 21.5″, OS X 10.11