Making more copies is risky too. A burglar might steal your home copy while you are not home... You may protect yourself from a natural disaster but then there will be other risks... On the other hand having only one copy is also risky because anything can happen to it. There isn't a foolproof easy solution to this problem imo. Physical paper wallets have their own risks, memorizing the seed words is also dangerous because dementia is a bitch... computers can get broken or get hacked if they are connected to the internet. Should you make 2 copies of your priv keys? Maybe. But I know for sure, you shouldn't make more than 2.
There is no easy solution, every choice will have risks and the risks will certainly vary.
Having more than one backup will be risky if the other backup is known by others, therefore securing all backups becomes the main focus.
Don't let one of the backups get out of your control. It is not easy to safeguard something valuable, especially when it is related to future investments that can only be opened with the key.
There are so many security alternatives that can be used as options, but look back at what risks can occur. Adjust to our needs and abilities as users.
"Security isn't securities. It's knowing that someone cares whether you are or cease to be"
- Malcolm Forbes
Entrepreneur and publisher (Forbes Magazine) from the United States