No, you shouldn't keep all that data forever

Modern ethos is that all data is valuable, should be stored forever, and that machine learning will one day magically find the value of it. You've probably seen that EMC picture about how there will be 44 zettabytes of data by 2020? Remember how everyone had Fitbits and Jawbone Ups for about a minute? Now Jawbone is out of business. Have you considered this "all data is valuable" fad might be the corporate equivalent?