It is important to backup your seed phrase but some people said the backup is not good online but which is true because we have seen how hackers was able to see some people seed phrase online and steal their coins. But I have been thinking recently that how can people in countries with natural disaster be able to backup their seed phrase offline? An example is the flooding that occured in Pakistan like 2 or 3 years ago that submerged 1/3 of the country under water. Even if you backup your seed phrase offline in many locations, it is possible that kind of flood can lead to permanent loss of your offline seed phrase.
Well this is case to case basis and if you know you are living on flood prone area then you should think about more ideal way to store your private key safely.
If you are a whale or just have plenty of balances stored in your wallet then its better to have a vault which is hard to carry and engrave your private key on a metal or anything same like element then put it there for sure you can assure safety whatever calamity comes on your place.
But for sure we can see a lot of interesting ideas from other people here since for sure they have creative ideas about how they can store their private key to avoid such unfortunate loss during on bad situations.