Hmmm immortality in my mind is that you live and can not die. But just copying your brain to an computer or make a copies of you and upload your data... is that really an immortality!?
People would have never figure out how to sustain life for one to live forever. Thay can copy brain and make a computer to talk like yiu and think like you and all but its imposible to prolong your life so much that you would never die. When we get old our body is braking down and it would need a constant fix. Not possible.