I have git repo living on Amazon CodeCommit but I want to save backups on Github or Bitbucket. Here's how:

Step 0 - Change Directory

First change directories to the git repo on your local drive.

cd /path/to/git/repo/

Step 1 - Add Bitbucket as a remote backup

You can create a remote git url by adding remote. In this example, I created a repo on bitbucket with an alias "mybitbucket".

git remote add mybitbucket git@bitbucket.org:chrisjmendez/repo.git

Step 2 - Add Github as a second remote backup

git remote add set-url mygithub git@github.com:chrisjmendez/repo.git

Step 3 - Business as usual

Now that you've added two remote backups, you can continue business as usual.

git add -A

git commit -m 'my commit message'

git push

Step 4 - Push to a specific repo

If you want to specifically push to your github repo.

git push -u mygithub

Step 5 - To origin an all remote backups

Push to all repos.

git push -u --all

---

Troubleshooting

Permsission Denied

If you get a Permission Denied error, check your access on your local machine and on Github.

git@github.com: Permission denied (publickey).
fatal: Could not read from remote repository.

Please make sure you have the correct access rights

Local Machine
It's helpful to first review what ssh keys are stored on your local machine. Open Terminal and type ls -al ~/.ssh to see what combination of public (.pub) and private keys are available.

ls -al ~/.ssh

Then use Terminal to open ~/.ssh/config and confirm that you have some configuration that looks like this.

Host github.com
    IdentityFile ~/.ssh/id_rsa # Default Example
    # IdentityFile ~/.ssh/my_custom_key
    IdentitiesOnly yes

If you do not, then follow these instructions on how to create an SSH key.

Github.com

Assuming you've created an SSH key for your local machine, confirm that the public key (.pub) is stored in Github > Settings > Keys.

Finally, double-check and make sure your username is associated to the repo.