Biotech seems like a better way. "Have robots grow us", maybe with predesigned adaptations to local conitions.
If it could record your emotional state and other inputs over years and make a model - it might even seem like you.
Such a system might be good enough to take care of the first generation.
So they are sentient in some horror way where they get woken to complete some awful, mundane task and then immediately put down again before they can scream.
(For the uninitiated, see https://qntm.org/mmacevedo and its corresponding HN discussion https://news.ycombinator.com/item?id=26224835)
You mean, copies of ourselves. Our current selves would remain right where they were before, and wither and die, while our copies would lead on merry and adventurous if disembodied lives. Provided they practice good backup hygiene of course. I find that quite depressing to think about.
Also I'm afraid we'll need to develop AI and technology that transcends us before it's ready to simulate one of us, at which point it may not make sense anymore.