A network of independent, redundant, internet archives.
It is impossible for, say, the New York Times to change or obliterate what it printed on some day in 1997. For NYT.com it's a simple as a mouseclick and a letter. That means there is no such thing as "public record" on the internet. Public record is the basis of a literate society.
"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.