So... i started cleaning skyrim with tes5edit (yes i know don't clean skyrim.esm) and it's making 2 back up's 1 outside the backups folder in my overwrite section and one inside... the one in the folder is called (for example) "update.esm backup XXXX" (where X Is the date) and the other one is the original name of the file... the differently named one seem to be a larger file... thanks :)