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@risc1::test /special   thank you.