Vegetano1 Wrote: all copy's will live a different live,.. so,. they won't be the same anymore,.>>?

Different copy, yes, but it's all essentially you!

Vegetano1 Wrote:travels to the future>>travels back and will die>>so if he won't travel back and die he can't know this in the future yet<>? because he did't travel back yet,.

Use information from other places, ie death records, newspaper etc.

Vegetano1 Wrote:it is,. but maybe that is whot will  happen if you try,..

If you travelled into the past and you also turned into your past state - including memories, brain state, etc, then there is no time disturbance, thus no-one really travelled in time...