I don't buy the "copy" scenario, and I'll tell you why. There's an experience aspect in NDEs where a person is on the operating table - and "dies." This individual is in the room as spirit, usually hovering over the table, watching everything that goes on. When the body is resuscitated this "spirit" goes back into the body. Later, they have a discussion with the doctors regarding everything they "saw" - and it's all verified.
So ... what went "back into the body?" A "copy?"
Whatever this "spirit" is, it's part of the physical construct. It was there at the time of conception, in both sperm and egg, because these component parts were "built" by the mother and father's bodies, where this "spirit" aspect is just part of everything that goes on.
The bottom line for me is that every cell in our body has this "spirit" aspect as part of the overall picture, and just like the physical body functions as it does, and the brain functions as it does, this "spiritual" component is a cell by cell build of the original. This is why it functions as it does, and the "bad spirits" are just like they were in their physical life because it's them.
This wouldn't be a "copy" ... it would be a componant part continuation of the original build.
The "copy" theory reminds me of the science behind Star Trek transporting and ironically in the New Testament mentions the resurrected bodies in Heaven will be different than our original bodies. I feel both are much different than downloading your "engrams" into a digital file- that is a "soulless" copy. I think a human demonstrates that "the whole is greater than the sum of its parts".
And in real life, since we have old cells that are replaced by new cells, we technically don't have a fixed body anyway, yet we maintain a sense of continuity.