Simpler, wrong and quite likely to give you useless 'backups' that cannot be 'restored'. A file copy is not a SQL backup. That the person you work with does it, does not make it a good way or even a workable way.
So when I overwrote the original file with the "Backup" (or that's what I thought) file, I have replaced the original file with a useless file? If that is so, am I hopeless? 🙁