title: How do I backup to google drive using duplicity?
body: <p>I have been trying to get duplicity to backup to google drive. But it looks like it is still using the old client API.</p>
  
  <p>I found some thread saying that the new API should be supported but not much details on how to get it to work.</p>
  
  <p>I got as far as compiling and using duplicity 7.0.3 but then I got this error:</p>
  
  <pre><code>BackendException: GOOGLE_DRIVE_ACCOUNT_KEY environment variable not set. Please read the manpage to fix.
  </code></pre>
  
  <p>Has anyone set up duplicity to work with Google Drive and know how to do this?</p>