Looks good! Looks like its got all the features I'm after
(multi-user/repository) and the price you mentioned was around about
what I had in mind as well. I too am in Australia (Melbourne).
As I have only started using rdiff-backup as of like a few hours ago
(well, most of the day), I want to make sure that it really is what I
need. At this point, it seems like it will be the way I will be doing
backups, I just have more testing to do. So if I do decide to go with it
then I would be interested in purchasing the web interface for it.