If you really wanted to preserve something, I'd consider printing it on gold leaf. One gram of gold turns into about 4 sq ft, and assuming we can print at 1200dpi, we'd have 4 x 144 x 1200 x 1200 bits, or about 100 megabytes. So you'd need about ten grams, at a price of $530 or so, plus storage. Though you could just bury it in your backyard.