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Recovery as a service (RaaS), sometimes referred to as DRaaS or Disaster Recovery as a Service, is a category of cloud computing where cloud computing is used for the purpose of protecting an application or data from a natural or human disaster or service disruption at one location by enabling a full recovery in the cloud. RaaS differs from cloud based backup services by protecting data and providing standby computing capacity on demand to facilitate more rapid application recovery. RaaS capacity is delivered in a cloud computing model so recovery resources are only paid for when they are used making it more efficient than a traditional disaster recovery warm site or hot site where the recovery resources must be running at all times. The term "Recovery as a service" (RaaS) is considered to be part of the nomenclature of cloud computing, along with infrastructure as a service (IaaS), platform as a service (PaaS), and software as a service (SaaS).〔(【引用サイトリンク】url=http://www.itu.int/en/ITU-T/focusgroups/cloud/Documents/FG-coud-technical-report.zip )〕 ==RaaS Architectural Models== RaaS architectural models vary depending on the location of the primary or source production application or data. * To Cloud RaaS : To cloud recovery is when the source application is in the users primary private datacenter and the cloud is being used as a backup or recovery target. * In Cloud RaaS : In cloud recovery is when both the source and recovery sites are in the cloud. * From Cloud RaaS : From cloud recovery is when the primary or production application or data is in the cloud and the backup or recovery target site is a private datacenter. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Recovery as a service」の詳細全文を読む スポンサード リンク
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