Comment by dannysu

I use KeePassXC [1], which is open-source, and I sync it across my iPhone, Windows laptop, and Linux desktop via Tresorit [2] (like Dropbox but end-to-end encrypted). It's secured with a password that I know, and a keyfile that I have. I don't sync the keyfile and always manually transfer to new computers.

I also use Arq [3] to automatically backup to S3 every hour, and I also do manual backup to my external backup drives once in a while.

  [1]: https://keepassxc.org
  [2]: https://tresorit.com
  [3]: https://www.arqbackup.com