Ask HN: How do you manage PGP/SSH key backups?

With different SSH keys being used for different git repos, I was considering adding those keys to my GPG keyring (which also holds those PGP keys that I use for storing passwords with pass, and signing commits), as outlined in this article:

https://opensource.com/article/19/4/gpg-subkeys-ssh-multiples

I'm however skeptical of this, as it seems like a hack at best (if this was common enough, we wouldn't have to use options like '--expert' and '--edit-key' with gpg). I'm curious as to how most people take backups of their keys, and store them securely.