[50cc]

I user SuperDuper to do a complete daily backup of our OS X server, this backup is put in a single image file on the same server, but on a second HDD.

I'm paranoid, so I also want to backup this image to a Linux file server. In order to do this I use rsync. The problem is that the image file is very large 20GB+ and counting.
When I Rsync this file to my Linux box it doesn't only copy the changed parts of the file, but the entire file. This takes way to long.

Does anyone here know howto tell rsync to be more efficient?