

For that scenario you could also consider using certificate based login. Just store your root certificate in a safe place (like a Keepass) an then sign new keys for your new devices when you get one.
https://docs.ssh.com/manuals/server-admin/44/User_Authentication_with_Certificates.html






















According to their German wikipedia page:
This means something like
Postillion seems to mean the person riding the/a horse pulling the post chariot [https://en.wikipedia.org/wiki/Postilion?wprov=sfla1].