Actually, the reason probably has more to do with the lack of a place to store this information about how the universe was set up at the time of our saving, since that would entail saving the knowledge of every atom of the universe-saving device within the device itself, plus all the information about the arrangement of mass and energy throughout the cosmos, which is somehow observed and recorded instantaneously, something that violates many laws of physics. Also it would be just as physically impossible to take all that stored information and turn it into a working model of the universe. Just a couple of the practical problems.

P.S. This is all assuming we don't live in The Matrix of course. Who knows?