I used to work at a place that had a second copy of all the git repositories on a server, available over ssh. We could push there and then, at deploy time, instruct the servers to pull from that repo instead of bitbucket.

If I were to set up the same thing again today, I'd add some automation to automatically keep it in sync with github as well as automate the servers so that they'd attempt to pull from both on every deploy.

I share this as an idea for those who need an emergency or backup deploy mechanism.