The amount of data that exists in the world today is staggering: indeed, I recently came across a study conducted by the University of Southern California, which concluded that if all the world's data was stored in books, that is, all 295 exabytes of it, it would cover the entire area of China three times over. And bearing in mind that this study was completed using the volume of worldwide data in 2007, and that most storage experts agree that the levels of data held worldwide doubles every six months, we could today be looking at a number that is 32 to 64 times greater than this!