Well, the danger of contamination would be in any host vectors used to clone the DNA. Its conceivable that a virus could infect the host vector and introduce i

Well, the danger of contamination would be in any host vectors used to clone the DNA. Its conceivable that a virus could infect the host vector and introduce its own chromosome into the host chromosome, but this probably wouldn't be a major problem. Any interuption in the encoded data should be easily detectable, highly unlikely in the first place, and there would be many copies of the dna. But the actual storage would be dna outside of a cellular context, in which case ot wouldn't be 'active'. The only dangers in that state would be water, heat, etc.