RacerJax

I would like to move my world back a couple of hours. I know every once in a while it says saving in chat, so I assume it is saving the world automatically. How do I access the saves if this is really what it is doing?

Something exploded in my world and I want to undo it. The server says every once in a while that it saves. Where do I access the saved worlds or is that not how this works.