Bob and Joe are friends. Joe decides to move his life to a virtual reality, and invents a device that copies his brain to a [very advanced] computer (killing his biological body and brain in the process). Form Bob's perspective Joe remains exactly the same (well, aside from him not having a body) - he has the same personality, memories, and so on.
But that's not really Joe, it's his exact copy. From Joe's perspective his life simply ended when he pressed enter. What really happened is that another, identical, Joe2 was created, while the original one (Joe1) died.
It seems that this is an inherent problem with any 'brain-transfer/copy' device that I can think of - they cannot transfer the original entity, but merely create a clone. For Joe1, pressing enter is suicide (although he does know that in a way his copy will carry on).
Is there (theoretical, but not magical) alternative that enables Joe1 actually move to a computer/robot/another human body/teleport by destructing and reconstructing his body? Other than putting his brain in a jar, or any other alternatives based on connecting his original brain to somewhere.