Yesterday, Tom and I were talking about advanced medical directives. In my living trust, Tom holds power of attorney in case I cannot make my own medical decisions.
Me: "Do you still have the email I sent you?" (When I set up the living trust, the lawyer explained that Tom would likely experience guilt if the situation transpired. He said it would ease my brother's burden if I explicitly state my wishes beforehand, which I did so in email.)
Tom: "Oh, I've definitely kept that email."
Tom: "Do you also have it printed out and stored somewhere?"
Me: "No. It only exists in email."
Tom: "That's the only copy?"
Me: "Yes. In Gmail I trust."