Two points. One, datacenter failure happens with any hosted application that runs within a single datacenter. Most other types of hosting also have a litany of

Two points. One, datacenter failure happens with any hosted application that runs within a single datacenter. Most other types of hosting also have a litany of other failure modes that go away with cloud, to be replaced by other modes. For example, you no longer have to deal with failures of individual hard drives, but now you have to deal with failures of EBS clusters. Two, cloud provides a standard system that makes HA easy. Rather then having to do dual dc failover in hardware and having to deal with bgp, anycast ips/dns failover, dealing with splitbrains and hw stonith/etc. All of this is just taken care of for you and/or made a lot easier.