Usually in stone (buildings/sheds), farmland, or readily usable goods that keep well/provide value (rice, dry beans, generator, fridge).
Sucks if you need to run though. But usually if you're wealthy in an unwealthy/poorly banked country and can't leave for some reason, you keep your assets in the place you'd run to if you really had to.
all of those things are fine and good, but they aren't something you can easily put your savings into - you have to save up to buy most of that stuff, and you can't just horde physical items without necessary storage and protection. Further for some people these things all pose substantially more risk than bitcoin. If someone burns your sheds down or salts your farmland because you can't payoff the local rebels, you risk losing everything, with bitcoin, having poor timing on exiting the market is risky, but certainly not 100% wealth loss risk and that's without even considering the aspect that memorizing a wallets secret phrase is the only upkeep you need to hold bitcoin. All of those physical assets bear some form of time/energy to maintain/upkeep and as you mention have a strong downside of making you immobile.
I'm not saying everyone should store their savings in bitcoin, but I am saying it serves a very real, potentially life changing purpose for some people and that shouldn't be discounted.
That has nothing to do with bitcoin specifically though. What you're describing is either someone using another currency or using some kind of digital payment system. It doesn't have to be cryptos.
Sucks if you need to run though. But usually if you're wealthy in an unwealthy/poorly banked country and can't leave for some reason, you keep your assets in the place you'd run to if you really had to.