This is really interesting stuff! One of the potential applications they call out is long-term data storage. How do you know that the stored data will actually last hundreds of years?
Also not part of this study, but an earlier one (ref 6). Basically DNA has been recovered from corpses that are thousands of years old. If stored properly, it is at least extrapolated to last up to millions of years [1].
1. http://onlinelibrary.wiley.com/doi/10.1002/anie.201411378/fu...