Apparently Apple has implemented directory hard links in their hfs+ filesystem, and it is the underpinning for the new 'Time Machine' backup in Mac OS-X leopard, where each incremental backup of an unchanged subtree is a single directory hard link. Seems like a very reasonable usage - though Time Machine presumably will not work on NAS boxes lacking directory hard link support (like Linux file systems.) [Ref: http://www.appleinsider.com/articles/07/10/12/road_to_mac...
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