Just a heads up in case anyone else runs into this issue -
My Time Machine was refusing to back up anything, complaining that one file wouldn't let it back up. Turns out the culprit was a harmless .DS_Store file, in ~/Library/Mail. I used the Terminal to delete it, and Time Machine no longer complained. 😀
My Time Machine was refusing to back up anything, complaining that one file wouldn't let it back up. Turns out the culprit was a harmless .DS_Store file, in ~/Library/Mail. I used the Terminal to delete it, and Time Machine no longer complained. 😀