I remember a similar question where we had to determine reachability in a VPLS setup. I think R4 might still be reachable, but I can't recall the specifics.
Fixed price is definitely the way to go here. The detailed requirements mean the project risk is low, so a fixed price contract will give the client the best value.
I'm not too familiar with the Cisco Unified CCX product line, so I'll need to do some research to understand the differences between the options and make an informed decision.
Changing the device concurrency settings sounds like a good strategy to me. That's probably the easiest thing to try, and it could make a big difference in the backup performance.
Galen
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