When I tell others they can use a password manager like LastPass, I’m often told – “what if I forget/lose that password, or what if LastPass goes down?”.
Quite a few people have been afraid of forgetting the password and getting locked out completely.
The solution is simple – most password managers offer you the option to export your passwords.
Do this periodically, and make an archive with a password you know.
If the online password manager disappears, you’ll still have your archive.
In my opinion, the risks for this happening are miniscule.