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--delete-afterin this usage scenario, what's wrong with this?--delete-afteris fine, but unrelated to the issue at hand. Files missing from the source will be deleted after the copy is done. The issue I'm elucidating relates to a backup being done today that is identical to yesterday's but against an old existing out of date file that is not linked to yesterday's inode, but stored as a new file at twice the total disk-space when yesterday's identical copy is considered.rsnapshot? Also, consider writing a small script to relink "identical" files. I do both on my systems.hardlink(1)is slow (15x slower than rsync's metadata scan);paxis faster but thrashes HDD heads comparing old backup to new.rsync -nto get the delta list means hitting production servers twice (scanning 10M files is far more impact than copying the 50K changes). Ill mail the list about an option in rsync to allow this.