I have been backing up my tables onto dvd (at work) for the past two years. I have gone through 6 different burners and have moved from -R to +R (about 40 terabytes total). We have tried out every major consumer brand as well as Ritek and arita. Why have we tried out so many different brands? The failure rate. First there is a failure rate when burning then there is a failure in longevity. In my experience these are crap brands: TDK, Phillips, Sony, and Memorex. You will lose 10 - 20 percent with these. Ritek has a low failure rate when it comes to burning (lowest possible speed). However I have seen many of my Ritek dvds that are over a year old fail. These have been accessed and read from at least twice a week for the past year. Currently we are using Arita (made by Ritek) and they have done fairly well. The best brand that I have encountered is Fuji. Low failure rate and they have lasted longer than Ritek. The problem with Fuji is the cost. Bottom line, Ritek is good for now but I don't think that any dvd recordable media is going to last. I can't wait for holographic storage.