It’s a big problem with WD MyPassport Essentinal. When a folder (imagine a ten GB folder) is renamed on my HD, MyPassport Essential considers it as a new folder created that has to be backed up without considering a removal of the same folder with the old name. In this case I’ll have 10 GB duplicated among the backup!
Smartware will see the folder as a new one, because it goes by folder name not by content. You cannot modify any names it will backup the info again.