We need stem cells as a part of data.
And Facebook and Google know us better and better.
Imagine that they, or smarter startups, develop by hundreds years.
And they have our cell and digital information. And lot of data from our times.
They can join it all together and try to recreate us.
Most of data (bio/digital) we collect now is for model creation purposes. But part of information that we collect now will serve as dataset they use to confirm if created model of you is really you.
Something like Turing test for created model of exact human.