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The digital copy can be kept alive long enough until we figure out how to download it back into a body again, at which point this is basically the ship of Theseus https://en.wikipedia.org/wiki/Ship_of_Theseus

Also some people might disagree with "digital copy of you != you". Personally, I do not care since it is close enough to immortality imho.

I do care about the fleshy me, but maybe the digital me could figure out a way for fleshy me to not die and fix my bum knee for sentimental reasons.

It won't do anything to solve the dread-of-nonexistence problem. But a copy that behaves just like you is still useful if your motivation is something like "ensure that my line of scientific research continues" or "take care of my extended family."

But even if it's a copy of your essence, it's not a slave. Mortal-you has goals and family to care about. Mortal-you has been living and planning with the constraint of mortality for its entire life. Immortal-you will eventually develop different motivations.

> Immortal-you will eventually develop different motivations.

Yah, well, mortal-me also eventually develops different motivations. There's still continuity and connectedness.

It's just fork(2).

How are you certain that you can survive a night's sleep?