If you are using something like OS X though, your options are limited to hacking a new file system into your OS. The instructions are very simple:
http://lildude.co.uk/howto-create-a-zfs-filesystem-os-x-leopard
Don't be put off by things like:
Now for the important part: right at the beginning, I said ZFS WILL crash your Mac.
Your Mac will crash a lot but it won't lose any data!!!
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