assumption 3.
The universe, any physical existence, is only present at any given time at that moment, on a knife edge so to speak , during it's relentless movement through time. . the knowledge, artifacts is what is carried into the future, the past existence is gone, although it leaves fossils, even the images that could be reconstructed from messages that leave earth now, the light, are only fossils. There is no reality stacked up, back to the beginning of / or in the past.
all we see is images of the past. Imagine you could have a mirror put, always at a quarter your age in light years, and beam, reflect back your doings. You could watch yourself at half your age. but you would be only only watching your fossil.
If our existence is the outworkings of laws, it would take an extraordinary, supernatural working to recreate any of it. even your brain-activity, if it could filtered out from all the electromagnetic stream that is travelling into the future.