Scientists have been eyeing up DNA as a potential storage medium for a long time, for three very good reasons: It’s incredibly dense (you can store one bit per base, and a base is only a few atoms large); it’s volumetric (beaker) rather than planar (hard disk); and it’s incredibly stable — where other bleeding-edge storage mediums need to be kept in sub-zero vacuums, DNA can survive for hundreds of thousands of years in a box in your garage.I believe that DNA is a better long-term medium than, for example, the "stone" DVDs announced last year. The reason is that "lots of copies keep stuff safe", and with DNA it is easy to make lots of copies. The Harvard team made about 70 billion copies, which is a lot by anyone's standards. Their paper in Science is here.
However DNA, like all "archival" media, poses a system-level problem. Below the fold I discuss the details.