While a solution using rsync would be ideal, if you don't have a huge
number of files or lots of huge files which meet this special case, it
probably wouldn't be prohibitively difficult to write your own special
case script.
It could be set to ignore all files that rsync will handle normally (but
https://bugzilla.samba.org/show_bug.cgi?id=13735
--- Comment #3 from Sébastien Béhuret ---
Thank you for suggesting the patches repo. An improved checksum/maybe-checksum
algorithm would be great but there appears to be a lot of work to achieve this.
Checksums are very handy for special cases (e.g