title: VirtualBox - Clone vs Snapshot vs Backup
body: <p>Looking for a simple answer to some virtualbox options..
  What are the differences between Clone &amp; Snapshot &amp; Backup?
  Which should be used when?</p>
  
  <p>I've just started with virtualbox &amp; have Ubuntu running on OS X as host.</p>
  
  <p>Basically i have setup Android SDK &amp; ADK and other tools.
  Just before i start building, i want to have a "backup" where if anything goes wrong, i can just revert to this instance of a clean installation.
  Previously i had a situation where Ubuntu locked me out completely &amp; i was unable to do much other than a complete re-install.</p>
  
  <p>Would it be just alright to have a snapshot &amp; revert to this snapshot if something goes wrong?
  Or would i need a clone of it? or both?
  and to backup, is it just sufficient to have a copy of the folder alone?</p>
  
  <p>thanks</p>