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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?):
As if stores of value will mean much when literally nothing works and we’re in Mad Max world.
Regardless, you’d think critics would understand that even in that scenario, being able to take currency and stores of value with you wherever you go, with no hardware, shiny rocks or pieces of paper to carry, all with just a 12 word phrase memorized in your head, is a huge benefit.
If you had to get out of Dodge and leave everything behind, EVERYTHING except your clothes on your back, you would KILL to be able to convert your entire net worth into an instantly accessible digital asset that is waiting for you once you settle somewhere.