> How could you upload just your brain and be the same person? Need your whole body, surely?. This overlaps with Transporter problem from Star Trek and the Prestige, it's not you who lives in there, just a copy.

Does it matter of the substrate is replaced a bit at a time or all at once? If so, why? If not, how is the “transporter problem” any different than what every person goes through all the time?