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Why not just install one of the many OS's (FreeBSD, OpenIndiana, FreeNAS, Napp-it, Nexenta etc) with full ZFS functionality on a server box / NAS unit?
It's also strange that no one has opened up on why ZFS was not incorporated to Mac OSX. DTrace which is present in OSX has the same license as ZFS.
Time Machine is simply crap, it may look good with the make-up is on but underneath is another story.. if you've used ZFS you'll know there's no comparison between the two.