“ when in a safe location”
By the time you need to do that, there will be no safe locations.
---------------------
There is BTC blockchain by HAM radio & satellite available if needed. Fire up the generator, etc.. But if things are as bad as you describe then you have more things to worry about...banks accounts gone, pension gone, credit cards not working, etc., etc.. Most Bitcoiners aren't planning for the "Zombie Apocalypse"...just currency devaluation/money printing/financial crisis (i.e. the 2008 "GFC" only worse).
All Bitcoin balances/transactions are recorded at tens of thousands of private locations worldwide (including my house). Just a matter of getting the network back up via Internet, HAM radio or blockchain satellite (and a generator?):