"If we had to evacuate Earth in a hurry..."
It would be too late.
Establishing self sustaining outposts on the moon and/or Mars would be insurance against global catastrophe. Kind of like the ultimate Svalbard Global Seed Vault, but for everything on earth: Humans, animals, plants, medicines, DNA of everything, KNOWLEDGE.
I'm sure you back up your data in your work just as I do, not because it's "cool" but because it is absolutely necessary for you to sleep soundly at night. The cost of backup drives is spent despite limited resources.