I’ve had this happen enough to just expect it “someday” and learned not to fight it. When Time Machine goes stupid, just wipe it and start over. Any efforts to

I’ve had this happen enough to just expect it “someday” and learned not to fight it. When Time Machine goes stupid, just wipe it and start over. Any efforts to try and recover or repair are just folly. Just watch your life tick away for days and days only to inevitably fail. It doesn’t happen often, but does happen every couple years. Many times it’s an indicator the drive is bad. That said, I’ve never had a problem recovering from TM. Whether it’s a single file, directory, or a complete reinstall. I have TM for my main drive, and use BackBlaze for everything (including my main and media drives).