When moving from Smartware to Smartware Pro, you gain the ability to backup to any external USB device, not only WD USB devices.
The same is not true about NAS devices, I have a WD My Book World Edition (White Light) 2TB, which unfortunately never got an update to work with Smartware. I think Smartware Pro should allow users to backup to any NAS device, from any manufacturer.
Also, it would be great to see more cloud storage options besides Dropbox. I Would love to see OneDrive, Google Drive, Box.