The backup reason is utter nonsense.
First of all, it presupposes that there's something morally important about human (or terrestrial) life; that's not at all clear, though.
It also presupposes that it'd be possible to recreate whatever it is that we want to preserve on Mars. But that's implausible. We're part of a hugely intricate machine. You can't just take bits of it and drop it on another rock and hope for the best - especially when that other rock is uninhabitable.
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Enzyme is powered by sunlight, Tue 31 Jul 2018, 10:25,
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