title: How to dump/backup a Solr index to a file?
body: <p>I'm running a Virtual Private Server where, every day at midnight, all files are <strong>backed up automatically</strong> by the VPS provider. </p>
  
  <p>So I need to <strong>export</strong> the Solr index to a file, so that if something goes wrong someday, I'll be able to <strong>import</strong> it back to Solr with ease.</p>
  
  <p>How can I do this?</p>