I was responding to your statement that you needed a backbone to be able to deal with DDoS attacks. That is simply untrue. Most hosting providers announce separate space from each location and do not backhaul. If you do want to sink attacks closer to the source (which in itself only really makes sense if you have highly diverse POPs) you can GRE the clean traffic between sites.
Your PeeringDB profile indicates you push 10 Gbps at peak. As this is getting quite long in the tooth for a HN thread, email me next time you are in the bay area. I'd happily share some operational tips for running high volume and attack sinking networks that really require a whiteboard. Heck, maybe we can get someone from Linode to join us too for beers. :)
