Management apparatus for storage system

An apparatus that manages a storage system, the apparatus comprising:

• a processor;
• and
• a storage device that stores a backup management model,
• wherein the backup management model includes:
• information of a snapshot generation of a volume, which is stored in a restoration destination storage system, and
• information of the snapshot generation of the volume, which is stored in a cloud storage system, and
• wherein the processor is configured to select a restoration source of each of the snapshot generations to be used for restoration of a generation designated in the restoration destination storage system from the restoration destination storage system and the cloud storage system with reference to the backup management model, wherein, in a case where a latest generation of a snapshot of the volume stored in the restoration destination storage system is older than the designated generation and is older than an oldest generation of a snapshot of the volume stored in the cloud storage system, the processor determines a restoration source of snapshots of all generations as the cloud storage system, and the processor restores the volume to the designated generation using snapshots from the cloud storage system.

A method in which an apparatus manages a storage system, wherein

• the apparatus stores a backup management model, and
• the backup management model includes:
• information of a snapshot generation of a volume, which is stored in a restoration destination storage system, and
• information of a snapshot generation of the volume, which is stored in a cloud storage system,
• the method comprising, by the apparatus, selecting a restoration source of each of the snapshot generations to be used for restoration of a generation designated in the restoration destination storage system from the restoration destination storage system and the cloud storage system with reference to the backup management model,
• wherein, in a case where the restoration destination storage system stores a snapshot of a generation older than the designated generation, and the cloud storage system stores a snapshot of a latest generation stored in the restoration destination storage system, the apparatus determines a restoration source up to the latest generation as the restoration destination storage system, and determines a restoration source up to the designated generation after the latest generation as the cloud storage system, and the apparatus restores the volume to the designated generation using snapshots from the determined restoration sources.

A method in which an apparatus manages a storage system, wherein

• the apparatus stores a backup management model, and
• the backup management model includes:
• information of a snapshot generation of a volume, which is stored in a restoration destination storage system, and
• information of a snapshot generation of the volume, which is stored in a cloud storage system,
• the method comprising, by the apparatus, selecting a restoration source of each of the snapshot generations to be used for restoration of a generation designated in the restoration destination storage system from the restoration destination storage system and the cloud storage system with reference to the backup management model, wherein, in a case where a latest generation of a snapshot of the volume stored in the restoration destination storage system is older than the designated generation and is older than an oldest generation of a snapshot of the volume stored in the cloud storage system, the apparatus determines a restoration source of snapshots of all generations as the cloud storage system, and the apparatus restores the volume to the designated generation using snapshots from the cloud storage system.