Depending on what exactly you mean with multiple datacenters, make sure you take a look at the pictures of their DC sites - the DCs in one location may be right next to eachother. Like having your servers in SBG2 and backups in SBG1.

You would need to use multiple locations, not just datacenters, for durability. The network performance between locations just isn't as good as between datacenters in the same location.