What application are you using to edit the files?
I know Open Office will make backups, and I think you can turn the option on or off. I had a look at my directories where I store files, and I have them also. I checked a couple of them, and they appear to be the same, ie. ture backups. Can you earse them, probably, if backups are not important.
There may be other apps that create backups.
Hope this helps.