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http://millenniata.com/
Produces optical media with a rock-like substrate on optical media--you're literally etching in stone.
They claim it will last at least 10,000 years.

http://millenniata.com/m-disc/

http://www.google.ca/search?q=m-disc

Would you like to buy some thousand-year-old snake oil? That's great, I brewed some yesterday.

The proof of millenial sotrage is when you find some thousand-year-old copies that are still readable. Hieroglyphs carved on temple walls count. So does ink on cured calfskin. No form of digital storage has yet got that sort of track record. It may last a thousand years; alternatively, it may not. Come back in nine hundred and ninety nine years and tell us how it's doing.

http://millenniata.com/m-disc/

http://www.google.ca/search?q=m-disc

According to Millenniata the M-disks are roughly $3 each. The internal drive is $50. But of course you have a point of "what are the requirements" in regards to data volume. (My photos will fit in under 8GB, but I don't have video.)

are you sure you are a few years out to being able to buy a 100 year recorder, the cost $50. http://store.millenniata.com/default.aspx

They have one. http://store.millenniata.com/default.aspx Blue ray writer $199.00

http://millenniata.com/ Supposedly permanent backup via DVD-like media. Seems pretty cheap for a decent long term storage/backup solution. Interested to see if anyone else has an opinion on this product.

Good quality CD-Rs and DVD-Rs can as long as 20-30 years if stored and handled properly; you get what you pay for. If you want real archive longevity, invest in one of these.

Yes, actually they have solved the problem of optical media degradation, there are now optical discs that record data in a rock like layer which does not degrade as organic dye does with other optical media. The company, named Millenniata, makes the discs and the drives to burn the discs, the great thing is they can be read in any optical drive compatible with the type of media (CD or DVD). Here is a link to the company:

http://www.millenniata.com/

Take a look at http://www.millenniata.com/ -- their tagline is "Write once, read forever." It's a group out of BYU, which is tied to the Church of Jesus Christ of Latter-day Saints, who have the largest collection of genealogical records in the world. They've been storing everything on microfiche in a massive vault, and would really like to switch to digital media but for the archival problems you mention. Millenniata grew out of research into making stable DVDs--they guess that their DVDs are stable enough to last 1000+ years (the way I've heard it, they don't know of any particular process that would cause them to decay, but you never know).