Use rsync's checksums to deduplicate across backups

[Alex Waite]

> Not a direct answer, but this may do what you want:
>
>  http://gitweb.samba.org/?p=rsync-patches.git;a=blob;f=link-by-hash.diff
>
>  This patch adds the --link-by-hash=DIR option, which hard links received
>  files in a link farm arranged by MD4 file hash.  The result is that the system
>  will only store one copy of the unique contents of each file, regardless of
>  the file's name.

This does look like what I was describing, though it seems it was
never included into rsync.  Is that correct?

---Alex