The problem isn't the data stream... its the breaking down and putting back together of the physical body.
Also, when you think about it, if they can teleport raw minerals, say petrol, from place to place, why not just break it down....
Then save the stream...
....Then rebuild it as many times as you want?
This is where cloning will come into effect - whats stopping them from saving *your* stream, and then making multiple copies of you??
Lol, what an interesting idea.
Bones