How could cloning help save endangered animals?

Cloning may be a quick fix to increase the number of individuals. However, numbers are not everything. What is more important to small population sizes is genetic diversity, in other Words the amount of genetic variation that exists within a population. Populations with significant reduction in genetic diversity will have a drastically increased likelihood of producing offspring with a recessive genetic disorder (the same reason why inbreeding in humans will likely result in some problem with the child). Besides this, genetic diversity allows populations to adapt in the event of a strong environmental change (e.g. climate change). In other Words, if the environment changes, diversity makes it likely at least some of the individuals are adapted to survive.