> if any datacenter is completely wiped out
Correct. When all of our datacenters were in Sacramento, California, some customers told us they were concerned because they were ALSO in Sacramento and a meteor could wipe out both their computer, the local backup, and Backblaze's cloud backup, all in one meteor strike.
While by default we put your data where it is convenient for Backblaze, we CAN work with customers (and have done so) to place their data in our Phoenix Arizona datacenter or one of our Sacramento datacenters if it is important. As we add our European region (coming soon) this will become a pull down menu for all customers. For now, we only work with larger customers to make sure the customer data lands in the correct location for them.