Insider Mac OS X 10.7 Lion: Auto Save, File Versions and Time Machine
Mac OS X 10.7 Lion makes a conceptual leap away from the Mac's original focus on opening apps to create files, launching a new task-centric interface borrowed from iOS. Lion apps can also auto save multiple Versions of the document for Time Machine-like recovery of previous iterations of a file.
http://feeds.appleinsider.com/click.phdo?i=4aa190004400c64f749b56f0763a6e62
