I suppose if there was a hypothetical interface (in the programming sense) for the brain you could create an indistinguishable implementation from the perspective of your consciousness. But really your conscious awareness isn't "you" at all. Think about how differently people perceive you from how you perceive yourself, how your conscious intention can be misinterpreted, and how your conscious and unconscious actions constantly manipulate the world. In a super heady sense, I subscribe to the idea that "you" is everything as a whole. That isn't a super useful definition to us living creatures, but to spiritual ideas such as reincarnation; technically your atoms end up somewhere. I think the rub is when people try to fit preservation of the human consciousness to these ideas, and I'd agree there is no way that's happening.