title: How to create a local mirror of public Jenkins update site?
body: <p>We are running Jenkins on a server that does not have internet access (even through proxy).
  Installing and keeping the Jenkins installation up-to-date is a pain!</p>
  
  <p>My idea was to make a local mirror of the complete Jenkins public update-site through a Windows workstation that has internet access. And then make this local mirror available to Jenkins through NFS share.</p>
  
  <p>So my questions: How to make the local mirror?
  Do you have a better/simpler idea to keep the Jenkins installation up-to-date?</p>