My system is more "I want to donate X GB" and it handles everything, filling that space up, getting the rarest torrents, getting updates, etc. Think of it as a central server managing a globally-distributed, unreliable JBOD in a "push" manner, rather than just downloading a torrent and being done.

Sounds a bit like Wuala https://www.youtube.com/watch?v=3xKZ4KGkQY8

Hmm, maybe, I don't remember exactly how it worked. I'll watch the video, thanks!