rsync with --link-dest will store each version of a file separately, including parts that are the same. It also won't hard link files in different areas of the

rsync with --link-dest will store each version of a file separately, including parts that are the same. It also won't hard link files in different areas of the tree that are the same, storing them multiple times also. Nor will it relink files that disappear and reappear, or change and then change back. I wouldn't really call it deduped storage at all. The optimisation it does do might well be sufficient for your needs though.