I'd also lose all my memories since the backup. With those memories goes the way I make decisions. Not the most desirable way of maintaining youth and health. Kirk made that point in ST:V:

"Damn it, Bones, you're a doctor. You know that pain and guilt can't be taken away with a wave of a magic wand. They're the things we carry with us, the things that make us who we are. If we lose them, we lose ourselves.

I don't want my pain taken away!

I need my pain!"