Yev from Backblaze here -> Yes we do plan on expanding to more datacenters, and we do have emergency plans in place, though we do choose our datacenters carefully to make sure that we avoid any natural-disaster prone areas. As for backing up our own data - we certainly do make backups of our core info/necessary data. As for the user data that we store, that's backed up across the storage pods in a vault as discussed in that post. We do not replicate customer data across multiple datacenters. At our price-point, that's just not feasible.