Disaster recovery as a service (DRaaS) is the replication and hosting of physical or virtual servers by a third party to provide failover in the event of a natural catastrophe, power outage or another type of business disruption. Typically, DRaaS requirements and expectations are documented in a service-level agreement (SLA) and the third-party vendor provides failover to a cloud computing environment, either through a contract or on a pay-per-use basis. In the event of an actual disaster, an off-site vendor is less likely than the enterprise itself to suffer the direct and immediate effects, which enables the provider to implement the disaster recovery (DR) plan even in the event of the worst-case scenario: a total or near-total shutdown of the affected enterprise. DRaaS offers an off-site DR capability that lets customers avoid the cost of maintaining secondary data centers. The approach has opened DR to organizations that wouldn't have been able to affor...