system
Given the following post, respond as if you're commenting on Reddit:
human
Why do people believe that uploading their consciousness will make them live forever?

Assuming a mirror of our minds could be uploaded to a computer and that it would be sentient, it doesn't mean it would even be me. There are two scenarios possible when uploading mind:

1. Original mind is destroyed
2. original mind in not destroyed

In the second case it's clear that the cloned mind is not me because I still exist. Case closed. In the first case, the fact that the second case is a logical possibility should prove that your mind cannot be transferred, only duplicated, so there is no useful insights with the first case. I just don't understand why science fiction even portrays this as a plausible thing in the far future tat could preserve yourself because it's just not you?

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The only alternative scenario I can envision is that you could perhaps link your mind across two different bodies using technology and one of those bodies could be robotic in nature. In this case idk but that seems very farfetched.
gpt
Well the reason many are cool with it is that they believe that continuity of personhood over time is nothing more than psychological continuity over time. 

If the copy on the computer or cloud thingy remembers being the mind in the brain/body and can fulfil its intentions and has enough other direct and indirect psychological connections then, to the psychological continuity theorist, that’s all that it means for the consciousness on the computer and the brain to be the same.