I've gotten it 3 or 4 times in the last 6-8 months. It makes a new backup from scratch which takes forever. Very annoying. I use it for the times when I mess s

I've gotten it 3 or 4 times in the last 6-8 months. It makes a new backup from scratch which takes forever. Very annoying. I use it for the times when I mess something up and want a file system level "undo" that goes back months. I'd be happy if it just used spare space on the drive. Which it does, but only if you are also backing up to an external drive.