No, I meant -Space tech tends to favour proven reliable technology, over cutting edge stuff, where it can. So, practically (given the current modus operandi of those who do this sort of thing), i think that's unlikely to be the case.Possibly could even be overtaken by newer technology.
If the journey takes forty years to get there, then, if, twenty years after they left we had developed systems which could go ten times as fast it could physically overtake the first vessel.
Why have you emboldened 'our'?That makes no sense; repopulation of some other planet because our Earth is dying, makes sense.If for repopulation because of a dying earth, then completely pointless.
Only to preserve the species. Why is that important - or necessary?
To everything. If we became extinct, who would know?To who? You? The Earth?It does not matter if we become extinct.
Why do you think the human race should be preserved?