Backrupr is a community-driven site, so will be designed around community tools.  Here’s the current thinking on each of the major components.  These are subject to change.
Information Repository
This will most likely be built on a wiki.  
Backrupr is currently at the planning stage.  My plan is to set it up as a non-commercial, community project.  This site contains FAQs and additional information on the top level plan, current design concepts, and how to get involved.  
Rating System