->Writing and keeping it with you/your place: What if someone got the access in your absence of theft or any disaster?
-> Obviously keep it online in email of any other way is risking your funds.
Keeping the mnemonic seed phrase safe should be one of the easiest thing to do to help keep your coins safe. They’re several ways that you can use to do that, diversifying and using different methods should be the best way for you to keep it safe. Every method has their own advantages and disadvantages, but just know that all the method can’t be compromised at the same time. When you can’t access one because it’s been compromised (lost or forgotten), the other ones you used another method to save could come as back up for it.
If you are living in an unsafe place, use a passphrase. If you lose your passphrase backups, you will lose your coins, just as if you lose your seed phrase backups. Do not backup passphrase together with your seed phrase.
What is this backup passphrase? Is it another pass phrase that can be used to unlock the original mnemonic seed phrase for your wallets? If not, what does it serves as in wallet security?