You can't back it up. For ssh keys for eg github this is fine, you just configure a new one as you dont need the ssh key to log in (eg I have password and multi

You can't back it up. For ssh keys for eg github this is fine, you just configure a new one as you dont need the ssh key to log in (eg I have password and multiple u2f tokens). For ssh to say servers you might want another key setup, you could have an offline software key, or multiple computers.