how to send only the diff ?

[Patrick Amirian]

Hi,
I'm trying to do so that rsync does not send a file that exists but is
different on the remote. I want rsync to send only the difference to the
remote. I prefer to send the difference of a 500 MB file than sending
the whole file over.
 
I use AIX and rsync version 
 
rsync version 2.4.5  protocol version 24
 
Oh and my command is :
rsync --stats --progress --delete --partial --timeout=60 --bwlimit=10
-aRtvz patrick at risc1::test /special
 
thank you.
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