Adding on to the Security section:
Add your keys into a password manager like Lastpass and be sure to have some kind of true multi-factor authentication on that password manager account. This was you don't have the keys stored in plaintext anywhere on the net, but you still have quick and easy access to it.

I would be a bit more cautious about emailing a password protected zipped version of the keys to yourself, because if you email ever gets popped, it is very easy to crack a password protected file locally.