title: rsnapshot on Linux fails with "returned 12 while processing"
body: <p>I thought I had rsnapshot all setup properly, but after checking my logs the next day I found the following:</p>
  
  <pre><code>[05/Sep/2014:10:34:11] /usr/bin/rsnapshot daily: ERROR: /usr/bin/rsync returned 12 while processing john@192.168.0.102:/media/linuxstorage/docs/
  </code></pre>
  
  <p>What does return code "12" mean?</p>