You want to migrate how much data?

How do you move a 500lb gorilla? Gingerly

Sooner or later, you're going to have to move some of your data. Perhaps you're moving to a hybrid cloud model, and need to move some offsite. Maybe it's already out there in a third-party's infrastructure, and the contract isn't working out as you'd planned. Or perchance you're being smart and replicating between two infrastructure-as-a-service providers for increased resilience. Whatever the reason, you've got some planning to do."