A Microsoft file hosting and synchronization service.
Exactly same as me. They somehow think it's better to save a new file in a different folder. That's absurd.
There is NO reason to create a 2nd file because there is the ability to go to previous versions if you made a mistake and want to go back. If they wanted to create a new file though(for some dumb reason), your current file should be the one that gets updated and remain in the same folder. The "old" copy of that file should be put somewhere else. That way we don't have to go to the Documents folder and grab the newer updated file and drag it into the correct folder and replace the old copy.
I don't even use AutoSave anymore. Just manually save it from now on.