Use the "passwords" feature to check if one of yours is compromised. If it shows up, never ever reuse those credentials. They'll be baked into thousands of botnets etc. and be forevermore part of automated break-in attempts until one randomly succeeds.
If your password manager has a password recovery mechanism, that means your key is stored on the server and would be compromised in a breach. If that's the case, I highly recommend changing password managers.
The ideal way a password manager works is by having all encryption done client-side and never sending the password to the server. If the server cannot decrypt your password data, neither can an attacker. That's how my password manager works (Bitwarden), and I highly recommend restricting your options only to password managers with that property.
If you need a backup, write it in a notebook and keep it in a safe. If your house gets broken into, change your password immediately before the thief has a chance to rifle through the stuff they stole. My SO and I have shared passwords to all important credentials, so that's out backup mechanism.