title: Jupyter notebook: How to save a copy of a notebook to a different directory
body: <p>Is it possible to save a copy of a Jupyter notebook in a different directory?</p>
  
  <p>My scenario is as such: I have jupyterhub set up using the docker spawner to create jupyter containers for users. I want all of these users to have access to a shared notebook, which contains a template for certain types of work. This notebook is served via a read-only volume mount into a <code>/shared</code> directory under <code>/work</code>. Users should then be able to modify and save a copy into the parent directory, to which they have access. However, the 'make a copy' function seems to only want to make a copy in the same directory, which is of course read only. Is there a way to change this functionality?</p>
  
  <p>Alternate solutions also welcome!</p>
  
  <p>(For reference, this is using the <code>r-notebook</code> kernel, but I doubt that makes a difference)</p>