Is there an obligation to resurrect extinct groups?

I'm raising this question as it pertained to group rights. Some groups have been systematically exterminated such as the Aboriginal Tasmanians through the genocidal policies of the Australians. If groups have rights and one of them is not to be exterminated as many human rights advocates claim, do they also have a right to be resurrected, say, through cloning or some other means? One may obtain enough genetic material from dead people to clone them. I'd imagine that once the technology is made reliable and cost effective, maybe the Australian government and other governments that have engaged in successful genocide of an entire group of people may be obligated to resurrect from extinction some members of the whole group. Groups, unlike individual people, can be resurrected from the dead and perpetrators, institutional or individual of their extinction, (or their ancestors) may be obligated to do so at least prima facie. But there might be significant ethical problems with this. If so what are these problems? One obvious concern is how many individuals must be resurrected? One? A few or the antegenocide population?