Just saw the public announcement of BBNet.Pro. As a beta-tester, I have been using it for several months. Here is my thoughts.
Everybody knows how important a backup solution is. And since Treo is an alway-on device, backing up all or part of your data to an online server makes a lot of sense. I don't want to get into all the UI or details of how it works. Just to share my real-world experience. Actually, during my several months' test, I used BBNet to restall my system at least twice and every time it went very smoothly. And I really perfer the way they put everything together - KISS (keep it simple stupid).
The developer Alexis and Scott are very responsive. They co-operated with Marc, the developer of the famous ChatterEmail, and fixed the reset problem within several days.
In recent update, they added the requested feature that is user-defined backup. You can manually select what you want it to backup. So in case you have some confidential data, you are not forced to backup them.
Just give it a try and I am sure you will find it really invaluable!