I could not find anything on how to do this exactly so I went ahead and have been able to get it working.
rsync works fine out-of-the-box, but there is no specific admin interface.
There is a nice contrib to manage
Remote User Access that will allow you to control some of that access.
Also a contrib to use rsync for backup. (Can't remember where)
I have created custom templates to manage the rsyncd.conf file.
A good start.
It is all done manually. There is currently no web admin interface. I still need to find out how to do that.
Have you looked at the developer manual (
Developers Manual)?
If anyone is interested I have created a cryptic HOWTO as a pdf. It assumes you know what how to do things but not necessarily what to do. Contact me if you are interested. I dont have a place to post it right now.
As per our 'other' discussion...

Send it to me
me and I'll see what we can do.
There are lots of features that could be added and they would best be done using the web management panels. That will be for another day though.
And we'll be happy to guide/help where we can.
Trevor B