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.
For me you should have multiple backups in different locations just to be sure at the same time it is secure, although we can't escape natural disaster having multiple backups and in different locations giving you a chance to be able to be safe, on natural disaster, regarding online backups you really don't have control over it since you don't have power over the devices and network infrastructures which hacker have chance to break the securities,