tTODO - dedup - deduplicating backup program
 (HTM) git clone git://git.z3bra.org/dedup.git
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       tTODO (262B)
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            1 Use a ring buffer in the chunker (avoid memmove() call)
            2 pledge/unveil support
            3 Ability to fetch key from dedicated fd so it never touches disk
            4 Use pread/pwrite to avoid lseek() calls
            5 Document file format
            6 Store repo stats
            7 Alternative storage backend using bundles