DVDBackup saves to a folder. So you'd simply direct DVD2oneX to that folder. Depending upon the brand of media you're using, I found Verbatim can generally be used to burn 4.37 GB but some other brands generally only 4.36 GB. So if the reduced size is too big for your disk, you may need to redo it using DVD2oneX.
The default size for DVD2oneX is 4472 (I think it uses 1kb = 1000 bits not 1024 bits.) You may need to set it to User Defined size & reduce it to say 4462 or smaller. I generally use 4482 but on one in 10 disks perhaps need to reduce it much further. Remember you can leave out languages you don't need which will help to save space without affecting the video quality as much. Though almost always DVD2oneX does a good job quality wise. With music disks I've sometimes had to set the user defined sizes to below 4000.

BTW if you're burning onto a DVD-RW (as I almost always do), then make sure it's been erased since it's last use.