Did you know? -Just 1 gram of DNA is theoretically capable of holding 455 exabytes – enough for all the data held by Google, Facebook and every other major tech company, with room to spare. It’s also incredibly durable: DNA has been extracted and sequenced from 700,000-year-old horse bones. But conditions have to be right for it to last.

http://www.newscientist.com/article/mg22530084.300-glassedin-dna-makes-the-ultimate-time-capsule.html#.VTIw61ImKJI