In order to provide a definite answer to this question, we'd need to know how the brain produces consciousness and personality, as well as the exact mechanism of the upload(e.g., can it rewire synapses?).
Not exactly true; we probably don't need to know how consciousness arises. We would certainly have to rewire synapses to match the original brain, and it is likely that if we exactly replicate brain structure neuron by neuron, synapse by synapse, we would still not know where consciousness lies, but would have a conscious duplicate of the original.
Alternatively you could hypothesize a soul, but that seems like worry for worry's sake.
The flip side to this is that there is no measurable difference between 'someone who is you and feels conscious' and 'someo...
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