Master Password Backup

There are two options that you could go with: 1. Write it down on paper and keep it in a safe. It is a good idea to have a water and fireproof safe for important stuff such as your passport, birth certificate, and in this case, a written master password. 2. Get a security key that encrypts the contents against a PIN or a password. Trezor wallets and OnlyKeys are the only options I’m aware of that meet this criteria. Avoid YubiKeys because they do not encrypt stored data and completely depend on potting.