How to push to two github remotes at once

For the purposes of backup and resilience, it may be useful to maintain two identical git remotes for a repo. Maybe one is on github, and another one is on a machine on another cloud. Then, you may want to automate pushing every change to the two repos at once.

git remote set-url       --push origin git@github.com:<username>/<reponame>.git
git remote set-url --add --push origin git@git:/home/git/repos/
git push origin

Push to multiple remotes. Add the hosted Git server as a remote: 

git remote add git git@git:/home/git/repos/jamserver.git

Set multiple push URLs for Github and the server:

git remote set-url --push origin git@github.com:<username>/<reponame>.git 
git remote set-url --add --push origin git@git:/home/git/repos/<reponame>.git

Verify push URLs: 

git remote get-url --all --push origin

Push to both remotes: 

git push origin

or to a specific remote: 

git push git

That's it!

.^.