WD smartware doesn't recognize my old backups?

After plugging my external drive back in and re-installing the smartware software my old backups are no longer recognized. My original set up had my internal drive and one smaller external drive being backed up on my large WD drive. The folders are still set up like this:

The top folder is my internal drive and the second folder is my external.

The files on my backup are almost identical to what I have on my computer right now (Minus the few months worth of new files) so I guess I could just delete my old backup. I was just wondering if there is a way to continue where I left off and just synchronize my new files without deleting the old backup or having duplicate archives. Here is a screenshot of my current situation in WD Smartware.

Hello,

I believe you cannot continue the same backup if you changed drives. You will have to create a new one.