Patent ID: 7669022

Claim:
A computer system comprising: a first storage system having a data storage extent for storing data sent from a host computer; a second storage system connected to the first storage system, and having at least one actual replicated data storage extent associated with the data storage extent; an archive appliance connected to the second storage system and having a storage medium associated with the replicated data storage extent in the second storage system; a data copy unit configured to control copy processing for reading data from the data storage extent in the first storage system and writing the read data to a first actual replicated data storage extent in the second storage system in accordance with specific configuration information; a connection switching unit configured to change the specific configuration information so that a second actual replicated data storage extent, instead of the first actual replicated data storage extent, is associated with the data storage extent; and a data transfer unit configured to control backup processing for storing data from the second actual replicated data storage extent to a storage medium, in the archive appliance, which is associated with the second actual replicated data storage extent in accordance with the specific configuration information.