Backup as a Service (BaaS) is a data backup approach that involves purchasing of backup and recovery services from an online backup service provider.

BaaS links systems to a private, public or hybrid cloud managed by an external service provider instead of managing backup through a centralized or on-premise IT department. BaaS allows backup administrators to not worry about maintenance of hard disks located outside the organization by transferring this responsibility to the service provider. BaaS can be used when the organization lacks the resources necessary for large amounts of backup. BaaS might allow the data to be accessible in case of a power failure or system malfunction, or to be recovered remotely.