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I capture to a second internal hard drive and copy all of my source files to external drives (primary and backup)and then delete from the hard drive.
I copy back the source files into the second internal hard drive only when creating a project.
I then copy the final project files and source files to another set of external hard drives (primary and backup).
When I am convinced that all copies are OK, I then delete the files from the internal hard drive and am ready to start a new project.
Expensive? Yes, but reliable. My time spent capturing and editing is important to me.
What are your source video files? If Mini-DV tapes then keep the tapes and don't re-use them. Also keep your PE project files and any other resources such as still images. Then if the worst happens you can go back and re-make your DVD.
Another approach is to copy your DVDs before they fail. With utilities such as DVD Info Pro and KProbe2 (the latter requires a Lite-On DVD writer), you can monitor the soft error performance from time to time and copy a DVD if the soft error rate looks a bit high. (Soft errors always occur and are corrected automatically for you by error correcting code.)
You say DVDs have a 10 year life, but I think no-one really knows. Technology is very different now than it was 10 years ago. Certainly if you keep your DVDs in a cool, dark, low humidity environment on edge, use good brand-name blanks and don't use stick-on labels they will last longer than if you don't.
I am terrible to ask this question. Most of my video is still on the tape. I admire anyone who can regularly sit down and transfer it. That being said, I have a couple of friends that dabble in videography on the side, and they WILL NOT trust DVDs. For them, their archives are on hard drive. That being said, hard drives will loose data if not refreshed every once in a while.
Basically, they purchase a new hard drive(s) for each project they do. When they transfer the video from the tape, they work off of the purchased drives. When the project is done, they keep everything on the hard drives. A couple of time a year they copy things around to different drives to keep things refreshed.
By the way, they also keep the original tapes.
Hope this helps,