Once you've made your video to dvd transfer disc, it's always a good idea to make a backup of your project in case the new dvd you created gets scratched or lost in later years.
While there are many software programs that allow you to do this, we've found the best way is to use the software CloneDVD. It does an excellent job of making an exact duplicate of your dvd, including chapters and menus.
CloneDVD is available here.