I'm thinking of self-hosting a password manager like KeeWeb but I'm afraid of my own self-hosted solution not being as reliable (downtimes / loss of data). Do you have any precautions against catastrophic failures?
Syncthing mirrors everything between my desktop, laptop, and phone (and there's an Android app[2] that works with OpenKeychain[3] so passwords are accessible from my phone). I haven't done this yet, but it'd be trivial to also run syncthing on a cheap VM somewhere, and replicate the passwords to it (but obviously not my GPG private key) for disaster recovery.
0: https://www.passwordstore.org/
On the desktop I'm using Browsers [1] and QTPass [2].
Most services are tied to my email, so I have both 2factor auth AND recovery codes that I have stored in a safe place. Additionally I have the Keepass password written down in a safe (separate) place just in case. This is my backup in case I lose access to my Keepass db.
As one last bit, I have Keepass to auto-lock after a bit of inactivity, so I'm constantly retyping that password. This helps me memorize it.
In many ways this keeps me safer. I stay logged out of most websites by default. It can also protect me against terrible password policies. For example, I once had a bank that limited passwords to 8 characters. I had Keepass remind me to generate and rotate that password every quarter just in case. When Heartbleed dropped, I marked all my passwords in red and only changed them back when I updated that website password.