I am also a worrier so I understand.
I believe in redundancy, so I carry our passports and have DH carry our passport cards. If one of us has them lost or stolen, the other has documentation that will also allow us to board the ship. (Before we had passport cards, I had him carry our birth certificates and state id cards as a backup.)
I print our passes, because I like to keep my phone stored in my cross body purse.