Hi and welcome to the forum
I can suggest an easier procedure for these backups
First of all, download and install ImgBurn (it is one of the best and free burning software). Yep, I know that you already have Roxio, but ImgBurn is better
Then, run ImgBurn and select the Read mode. Insert an original disc on the drive, and then press the start button. If the original disc has no protection, ImgBurn will start the copy. If you get an error because or some protections on the original disc, then you need to install another software to remove these protections.
Another free software is DVDFab Decrypter. Download and install it, then use it to copy the original DVD on your hard disk.
Once you have the original DVD copied in your HDD, you can use ImgBurn to burn files on a blank DVD