DVD Shrink :
http://www.dvdshrink.org/
What is DVD Shrink?
DVD Shrink is software to backup DVD disks. You can use this software in conjunction with DVD burning software of your choice, to make a backup copy of any DVD video disk.
DVD Shrink does not burn DVDs! The output from DVD Shrink is saved as files on your hard drive, which you can then burn to a DVD-R using separate burning software, such as the software provided with your DVD-R drive.