The most expensive factor in traditional archival storage is that it is not durable and, thus, over the years, it is necessary to do many migrations due to degradation and technology obsolescence. DNA reading technology, due to the immutable format of the DNA molecule, will not be obsolete, mitigating this obsolescence. However low cost DNA storage does come with some imperatives. Indeed DNA outside the cell, as with any biological molecule, will be subject to aggressive degradation factors, the main one being water.