[wankle]

I keep my codes on an encrypted thumb drive I store in a fire proof box along with important documents.

As for the OP, it sounds really convenient but convenience is what led to Code Red Worm in 2001.

[TeMPOraL]

You have that thumb drive backed up? Because thumb drives can, occasionally, spontaneously fail, for no apparent reason whatsoever, and the fire-proof box isn't going to help (hell, it may make matters worse if futzing with it generates ESDs).

Also: where do you keep the encryption key for that thumb drive?