Patent ID: 8464010

Claim:
A method for ensuring periodic data backup control in a virtualized storage system having a point-in-time copy function operable to copy first data into a cascade and comprising steps of: creating an incremental map of production data using storage from a physical storage associated with a target virtual disk; selecting, by a storage targeting component, the target virtual disk for one of a full copy or an incremental copy of the first data; triggering, by a periodic backup component, a periodic point-in-time copy of the first data to a virtual disk in the cascade; testing, by a testing component, a status of the full copy, the incremental copy and the periodic point-in-time copy; and responsive to the status, splitting, by a cascade splitting component, the cascade to remove a dependency relationship of at least one of the full copy, the incremental copy and the periodic point-in-time copy on the first data, and to insert a second target virtual disk between the first data and the full copy, the incremental copy, and the periodic point-in-time copy, wherein: prior to the splitting of the cascade, the first data is located at a first position in the cascade, and the full copy, the incremental copy, and the periodic point-in-time copy are arranged in and make up a first configuration of components located in a second position downstream from the first position, during the splitting of the cascade, the second target virtual disk is inserted immediately adjacent the first data between the first position and the second position, and as a result of the splitting of the cascade the first data remains at the first position, the second target virtual disk is re-positioned at a location not immediately adjacent the first data, the full copy, the incremental copy, and the periodic point-in-time copy are rearranged into a second configuration that is different from the first configuration of components, and the first target virtual disk is isolated from the cascade and attached to a new virtual disk.