In case you want to explore the card's abilities further: http://hackaday.com/2013/08/12/hac…

I have a microsd card in my wallet with my health insurance information, a "mini will", and information on how to reach me if I lose it and someone finds it.

Couldn't have said it better myself.

What's your biggest concern about the mission? (Dust, pot-holes, meteors, aliens, etc?)