Yes. There were backups for 5/27, 28, 31, and 6/1. All of those were scrambled. I found the problem when I went to add my data for 6/4.Ugh,
I know Google Sheets has some kind of automatic backup scheme, but I haven't had the pleasure of using it.
May 25th was over a week ago... Were there other more recent backups that were also corrupted?