In order to recreate biologically dead human beings, you need their memories, not just skin and hair and eyes. A quartet of predictions about the future from John Smart‘s long-form post at Kurzweil AI about brain preservation::

“1. As I argue in this video, chemical brain preservation is a technology that may soon be validated to inexpensively preserve the key features of our memories and identity at our biological death.

2. If either chemical or cryogenic brain preservation can be validated to reliably store retrievable and useful individual mental information, these medical procedures should be made available in all societies as an option at biological death.

3. If computational neuroscience, microscopy, scanning, and robotics technologies continue to improve at their historical rates, preserved memories and identity may be affordably reanimated by being ‘uploaded’ into computer simulations, beginning well before the end of this century.

4. In all societies where a significant minority (let’s say 100,000 people) have done brain preservation at biological death, significant positive social change will result in those societies today, regardless of how much information is eventually recovered from preserved brains.”