[skybrian]

Well, it's true that a password manager is a single point of failure.

If you have two password managers then they can serve as backups for each other. Unfortunately that means you have to register each account twice.

[precommunicator]

Just use a password manager that allows you to have a local copy of everything (e.g. KeePass) and just back it up as any other file

[skybrian]

That could work, assuming your usual file backup methods are secure enough and it doesn't create a circular dependency.