Re: distributed knowledge?
My first idea is that your valuable data can be watermarked into pr0nography files (e.g. naughty videos), and then uploaded to the 'net. Within seconds, dozens of thieving/freeloading pr0n servers will steal copies of these files, and host them on their own pr0n servers for fun and ill-gotten profit. So your valuable data, secretly watermarked into the files, will be widely distributed and publicly available. It's really the ultimate free, distributed, crowd-sourced backup system. It'll almost certainly survive nuclear war and asteroid impacts. And it justifies smurfing pr0n during working hours, 'cause ya know, "...just checking the backups."
My second idea is that precisely all this has already happened. Which would explain a great deal.