So I have a client wanting to sync one of their backup servers and frankly I have no solution to this one without using the same software again on a second offsite server. I figured I'd try rsync doing this:


Code: 
rsync -avz --delete --progress –rsh=ssh -e'ssh -p 3232' /drive root@blah.com:/
Works fine on the standard files and some of the data files that are the incrementals. The problem is there are a few big binary files that are 15GB in size. These files will change just a few bytes and now it'll transfer the entire file again as it cannot just add on the changes or anything like that. This takes close to a day to complete making it not very useful as the backup system cannot make new backups while this is going on.

Confirmation on this not being possible with rsync no matter what the parameters would be great. I think I'm trying to do the impossible but I always like opinions from others.