title: Can Mac app store apps access local file system?
body: <p>I am wondering what limitations are imposed on the Mac app store.  Can someone point me in the right direction?  For instance, lets say I wanted to write an app that does incremental auto-backups of files on the Mac file system, is that possible with an app in the Mac app store, or would my only option be a standalone mac app?</p>
  
  <p>On the iPhone, apps are self contained in their own "sandbox"? Does this same principal apply to mac app store apps?</p>