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.
This is a very smart question but I think when you buy a hardware wallet or an airgap device for storage or your coins, the reason for backing up of your wallet is not to discard the hardware wallet right, the back up is just a preventive measures and caution should incase you loss access to your wallet. In a situation like this, proper care of your hardware wallet should be a priority to keep your coins safe, make sure your hardware wallet is in good condition and be ready to access quickly when you need it and not just the seed phrase back up alone.
As for the seed phrase, online storage system is very unsafe, the moment your documents touches the internet, just know that it's not longer safe and that's why offline storage remain the best way. If you are coming from a place where natural disaster happen a lot, I think storing your coins in another country is not bad. If you have thousands and millions worth of Bitcoin, you will do anything to protect it right!
I still remember in one of
Vitalik Buterin interview how he got rid of Shiba that was sent to his wallet address. Shiba was airdrop to him and was worth Billions of dollars but he didn't have access to that wallet address as it also contain some ether in the wallet. It was a cold wallet that was key divided, half of key was with him and the remaining was with his family in Canada, he has to put calls through to get the half of the keys before he was able to send out these coins and donanted it to India for relief fund for Covid.
In a situation like this, I will go far to make sure that my Seed phrase is hidden in different locations, it's better than keeping it in a risky environment.