I also think it will be better to store that way in cloud storage. Storage like you save in google drive, it will be safe there for anytime that you like to restore it after a war when you survive it. If you keep in google drive you have to remember the password to login to the google account and if you do that it will open everything you have keep there. You have to keep the password save no matter how long you will access it back like your email too.
So in reality the problem is happening right now, the story is your life or your money, which is more important?
Luckily, the current life in the country I live in does not encounter this situation where catastrophic wars have ended. But I still hear from the previous generation about the transfer of power, monetary issues were almost meaningless and the assets people hoarded at that time were bars of gold, silver, pearls,... The way they do it is to put it in a box and drop it into the water tank and of course it is secret, even if it is no longer alive, there is still a chance for someone else to find it and use it. In this era, we have bitcoin as a new way to store assets and there are also many ways to store secret things, but in my opinion, try to save your life first.