Upfront theme revisions

I am playing around with the Upfront theme, comparing it to what I already know and used to working with. I would like to know whether it is possible to go to previous versions. Eg when you made major mistakes, can you go back.
It would be great if there'll be such feature as revisions in upfront themes, for when you are just playing around with your design and decide the version from 3 hours back was better!