I think that we are in perpetual evolution. Our memories are perpetually updated, and we make our choices based on our experience (and probably some biochemical mechanisms that affect the decision making process, probably by changing how those memories are accessed, among others.
Aren't we dying everyday, for someone else to wake up in our place the next day? To put it more bluntly, our consciousness is interrupted for the night, a "garbage collector" running, and we "reboot" the next day. What about this night you can't remember because of alcohol? Someone was here, controlling your body, yet it wasn't you (and to repeat myself, the one writing this - me - is probably going to be slightly different than the one reading the possible replies - "me" as well - and that's OK).
What I find valuable is experience. Period. It takes a huge amount of energy to train a child, and the goal is for him to be beneficial to the society (think tribe/species if you want) in return. He will be able to pass on part of his experience to the next generation, thus improving the pool of knowledge for the society (this is a general rule, it can work with genes as well).
Thus, jumping a bit to conclusions, I value my experience and memories more than this body. And I would gladly part with it if it could mean a longer life span for them. Even existing only as an "archive". But I consider that I have still much data/experience collection I can do before passing out. And there is no way to pass this data on.
If you think about it this way, a copy is a fork, and is likely to preserve experience: that's good. And cooperation is a given if the two share this idea. Moreover, I consider it to be a rather optimistic and cheerful way of viewing things, it can be comforting at times; And I feel like some robot apocalypse or similar is simply a non issue, as long as knowledge is preserved.
That's the thought process you can have if you think too much about issues like teleportation.
Now, I need to get back to work on my brain scanner.
Seriously though, what is your opinion on the matter, now that I exposed my current one? I would be curious if you could "share your experience" with me :P