title: How does the updatePolicy in maven really work?
body: <p>When I define an <code>updatePolicy</code> in my maven settings it tells maven how often snapshot artifacts shall be downloaded.</p>
  
  <p>If I set it to always it of course downloads every time all snapshots.</p>
  
  <p>I was wondering what happens if I set it to the default value daily or another longer peroid.</p>
  
  <p>Does maven still check whether a new version of the snapshot is available and if so, does it download it although the policy says daily ?</p>
  
  <p>I'm looking for the correct settings to avoid redundant downloads and not to miss a newer snapshot out there.</p>