Excellent suggestion! Preservation of endangered species due to longterm storage of DNA at the facility of a cryonics-provider will be great PR. Ten DNA samples should fit into a little capsule the size of a thumb. Drop it into the dewar from KrioRus, and they will get best PR for a minimum of costs. They don't have many patients under suspension, so I guess they have free resources available.
You can even put a piece of a cheek swab sample with DNA of mine into that little capsule to store it together with other samples from the loggerhead turtle, komodo dragon, greater horseshoe bat, and other endangered animals, see http://www.ypte.org.uk/environmental/endangered-animals-of-the-world/24
for info. That would be good for the animals and also for me, because I'm always trying to keep a DNA sample of mine from getting degraded. Cryonics for such a small container would barely cost more than a thousand US Dollars for 100 years of storage. Well, I would be able to pay 500 Dollars for this. If the other 500 Dollars can be donated by an organization who is funding gene banks for wild life preservation, then the costs are balanced.