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...purge) are at http://www.cmb.usc.edu/people/dld/backuputils/. hashimplode calculates the hashes and hardlinks files. hashdelete removes a snapshot, removing orphaned hash files as it goes, and hashpurge is roughly "find /hashdir -nlinks 1 | xargs rm", in case you haven't always used hasdelete. All three use rename() to avoid races on files so they can be interleaved and run in parallel while sharing the same hash directory (which we're doing to utilize the parallel seek capacity of RAIDs and to back up multiple smaller fileservers at once). hashimplode has an option to skip files...