I use my own password manager and would not trust many proprietary third-party developers to get things right. Most of them have a long history of failures. It

I use my own password manager and would not trust many proprietary third-party developers to get things right. Most of them have a long history of failures. It's safer to self-host and store encrypted backups elsewhere for integrity. If you're not familiar with encryption or cryptanalysis, then you can use some open source encryption programs and a text file on an encrypted partition. That's a thousand times more secure than any proprietary online password manager. For some passwords it is also more secure to keep them in plaintext on physically secured notes. It depends on the threat scenario.