Considering this vast amount of data, I figure they will have to forego standard backup procedures. About the best they could do is do real cloning between centers. I don't want to do the math, but a Petabyte storage device would fill up rather quickly. I can see drive space manufacturers making a ton of dough from this little adventure. Maybe new technology will come out of this.
We shall see how far this goes. It is dangerous to store that much information.