I'm using ssh keys to log in some servers. My private keys hasn't a passphrase, but I'd like to store it in an encrypted online storage service. Is that safe? Are there any free available options? If I decided to add a passphrase to my key, could I safely store it in services such as Google Drive?
Is there a way to use the same key both with and without passphrase or should I make two different? In that way, I could use the first on my personal laptop and store the latter on GDrive.