And therein lies the argument... that it would be cheaper to building in data-center redundancy into your design that it would be to ensure that your data cente

And therein lies the argument... that it would be cheaper to building in data-center redundancy into your design that it would be to ensure that your data center had 5-nines of uptime. And if you're large enough to require 5-nines (or even 4) of uptime, you should be looking at data-center level redundancy anyway.