Your password leaks somehow, somewhere: Most intelligence agencies in the world have access to your wallet.

If you use LiveCD Linux, it is almost impossible.

You literally suggested cloud services for backup, now you suddenly switch toLinux live CD. Please stop giving advice here.

Can happen only if you are person of interest for them and they have installed hardware keylogger or other spying device into your PC.

Everyone is a person of interest for NSA and every single both Intel and AMD CPU has a backdoor.

I don't think it is easy even for NSA to crack 30 character password for VeraCrypt container with AES-Twofish-Serpent cascade encryption.

So naive.