You know information is never truly destroyed. Bringing Dr. Sagan back will probably remain too difficult for a couple generations, but, eventually, we'll figure that one out.
And I can imagine the look on his face.
Information is always destroyed, and the universe uniformly has less net information now than it did a second ago; that's the second law of thermodynamics.
However, note my use of the term "god-like". Anything capable of doing this is so close to being a god that it makes very little difference from our point of view. There's also the theory that our universe is a simulation run by such an entity - the argument is something like "if it is possible to run a simulation of the universe, it is statistically far more likely that we're in such a simulation." Sort of makes sense, if you have the right mind-set or tilt your head and squint.
But, like I said, it's a problem to be solved by our smarter successors, not for us.