I've got lots of stuff, concert videos and what not that took me years to track down. I've transferred my rare vhs tapes to DVD+R discs.... I've heard that blank DVD's don't have a very long life span. I was wondering what the best method of preserving my digital video to last a lifetime? I was looking at these Mobile Fidelity 24k discs that are supposed to last forever. I was wondering would it be better to get those or more affordable and efficient to get an external hard drive to backup all my DVD's?