EDIT: (For git non-pro's like me)
How does one create a copy? After creating an empty repo on the web interface:
git remote add bitbucket <url of the repo>
How does one keep it updated?
git push bitbucket <branchname>
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Or if you'd like to always keep the bitbucket repo in sync every time you do a git push origin (preferred method):
`git remote set-url --add --push origin <url of the repo>`