According to the original article referenced here:
This caused a lot of our customers to freak out," Backblaze Marketing Manager Yev Pusin wrote in an e-mail. "The reason we saw a huge uptick from our customers is because Backblaze's .bzvol is higher up the alphabet. We tested it again by creating a hidden file with an '.a' name, and the files inside were removed as well.
I did access all invisible files on my Mac. Looked at root level sorting alphabetically I see .Adobe as the first! Kind of makes sense that Adobe's installer would try to delete it. Not sure why .bzvol was affected, it should fall below .Adobe. Anyway, using Time Machine, I went back well before this update of CC, still see .Adobe folder with two items. So I don't think I have anything to worry about (nor did I ever use Blackblaze). Anyway, one can backup such files from TM once they have ability to see the invisible files.