I've had this worry as well, in regards to loosing passwords. I still believe writing everything down on a piece of paper can help. I have a little black journal that I carry with me everywhere that has all my passwords in it. Typing them in is the issue when they are longer strings, and mixed symbols.
Only issue is protecting that journal.. Hopefully I can eat the pages if things were to arise. Ha
If you are sufficiently paranoid about having to destroy the notebook, tissue paper and water soluble ink go a long way to making it easier. I made about a dozen for a murder mystery party about two years ago and still have one lying around somewhere. A small waterproof bag should make sure it isn't inadvertantly damaged in the rain.
Haha, yes or loosing it. I think that having a back up would be much needed. It's really too bad to think that we have gotten to this point. Not to be the paranoid one.
Only issue is protecting that journal.. Hopefully I can eat the pages if things were to arise. Ha