What often seems to be overlooked when talking about using DNA for storage is that microorganisms want to eat it for their own uses. DNA in the environment isn'

What often seems to be overlooked when talking about using DNA for storage is that microorganisms want to eat it for their own uses. DNA in the environment isn't just ignored, it is quickly degraded by excreted enzymes and then taken up by cells. Trying to keep the area sterile by typical biology techniques would also compromise your storage DNA. Oh, and also if you put it into an organism, you better pick a plant. Many organisms (particularly microbes) are under strong selective pressure to excise DNA that isn't essential or very useful. Even in plants, your sequence is going to get corrupted over time by mutations down the generations (or even just in the one generation if your plant lives a very long time).