Earlier quoted context omitted.
What a weird question. You're always you, until you die. Even if you became totally paralyzed, blind, deaf, etc. (total sensory deprivation) you'd still be you. All that is you is just the voice in your head, the ability to ask the question, and to think about an answer. As for what happens to your body or anything else in the world? You can't ever get rid of those doubts. The only thing you can know without a doubt…
In context of the thought experiment there can be more than one person with equal claim to be the person that you believe yourself to be. For example, given the postulated copying technology there could be Two or ten or a hundred people with the same claim 91 you to be today's version of who you remember yourself to be. The only thing that makes one person's claim better than another's is a perceived continuity of ph…
Now, you could contrive a thought experiment where you clone me in such a way that neither I nor the clone know which one of us is the clone, but then, how is that any different in principle from babies switched at birth in a hospital?
Your memories don't define you, since they may be false. The only thing that defines you is your consciousness in the present. Everything else is I/O, and subject to interpretation and trust.