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Print out 2FA codes and bury them somewhere.

It's not that hard, and you feel like a proper spy doing it ;)

Please don't depend on this. Paper does not like moisture and soil is full of it.

Use an escrow or custodian (lawyer, bank, etc).

Paper inside a plastic bottle will be fine.

Soil is acidic, and soda bottles are meant to keep their seal for a two years, not a decade.

laminate?

Is your laminate rated to be in constant soil contact for however many years you need to hold onto a backup code for?