Hello

I have a couple of friends who backup some of their important folders on my server using rsync.

When you run rsync on the client side, it tells you how much data was sent. One the server, all that happens is that you get a log entry saying the the rsync server was started, the user, IP etc.

Rsync compresses stuff before it sends, therefore, the bandwidth used is smaller than the file space taken up by a new document being sent over.

Is there a way to get rsync on the server to tell me how much COMPRESSED data was sent to me?

Thanks
Hamish

Take a look at the rsyncd.conf man page:
man rsyncd.conf

Then skip down to the "transfer logging" and "log format" sections.