Isn't DNA orders of magnitude slower than current storage media?
And though we're not quite there yet in read/write speeds at the ends of the route, the old saying rings true about the fastest way to transfer large amounts of data between the coasts - in a station-wagon full of hard drives.
Importantly, expected corruption of the data stored in DNA is less than what one expects using other forms of data storage. So if stability of the data is a concern, DNA has unique advantages.