You might also want to take a look at LOCKSS (I'm not affiliated; just thought it was interesting):
"LOCKSS (Lots of Copies Keep Stuff Safe) is an international non-profit community initiative that provides tools and support so libraries can easily and cost-effectively preserve today’s web-published materials for tomorrow’s readers."
Currently OpenBSD-based, but I think that I heard that they are looking to migrate to FreeBSD to take advantage of ZFS.