I would hold a bit more precious metals than that to diversify. The Internet may be down during WW3. But I recommend silver, because 1oz silver coins are low enough value that they can be used for practical transactions, whereas you have to buy a hell of a lot of stuff to get your value from 1oz of gold.
Discussion
I’ve got some silver Krugerrands for this but I also gift them to kids - they can’t spend them and have enough value that the parents won’t just chuck them.
But if you anticipate the internet going out during WWIII, unless you’ve got a self-sufficient homestead and plan on hunkering down and fighting off bandits, precious metals won’t do much for you. Better to plan for where you can go that is likely to be nowhere near fighting and also not be at risk of government officials coming to conscript you in to service - then BTC is still the right bet.
NZ ought to be a safehaven but you’re likely to be cutoff from the world and if all the American elites who started it all decide to take shelter there, that’s just a gigantic target 🎯