More cloud vendors are adding backup to the choices they offer customers, letting enterprises that embrace the cloud for applications, computing, and storage also go there for business continuity. On Tuesday, global services provider Dimension Data announced it will offer cloud-based backup as an option for its CaaS (computing-as-a-service) offering beginning in October. The announcement came the same day that Backupify and Nasuni introduced services that can back up cloud-based data to another cloud.