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Passkeys might really kill passwords
(www.theverge.com)
This is a most excellent place for technology news and articles.
2024.1.2 released with self-hosted server passkey support.
TBH though I would not trust myself to self host my keys to my digital life when the alternative is $40/year for the whole family. You may have a different perspective though.
You can just use something like YunoHost, and synchronize weekly encrypted backups via Nextcloud or Syncthing to all of your computers. That way, if your server ends up busted for whatever reason, you can just restore it elsewhere and go back to business