When stored on most conventional storage devices—USB pens, DVDs, or magnetic tapes—data starts to degrade after 50 years or so. DNA could hold data error-free for millennia, thanks to the inherent stability of its double helix and Reed-Solomon codes. If kept in the clement European air outside their laboratory in Zurich, they estimate a ballpark figure of around 2000 years. But place these glass beads in the dark at -18C, the conditions of the Svalbard Global Seed Bank on the Norwegian island of Spitsbergen, and you could save your photos, music, and eBooks for 2M.

and using CRISPR to store movies:

We use the CRISPR–Cas system to encode the pixel values of black and white images and a short movie into the genomes of a population of living bacteria. In doing so, we push the technical limits of this information storage system and optimize strategies to minimize those limitations. They also uncover underlying principles of the CRISPR–Cas adaptation system, including sequence determinants of spacer acquisition that are relevant for understanding both the basic biology of bacterial adaptation and its technological applications. This work demonstrates that this system can capture and stably store practical amounts of real data within the genomes of populations of living cells.

another approach:

Roswell is bringing the $100 genome that can scale rapidly and also deliver Exabyte data storage.

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