Hal Varian Rule of Thumb

Between the dawn of civilization and 2003, we only created five exabytes of data [5 thousand gigabytes]; now we’re creating that amount every two days ... by 2020, that figure is predicted to sit at 53 zettabytes (53 trillion gigabytes), an increase of 50 times. ... data is like food: we used to be calorie poor and now the problem is obesity; we used to be data poor, now the problem is data obesity!