Patent ID: 7877359
Filing Date: 2011-01-25
Classification: G06F

Abstract:
1. A computer system comprising: a storage system coupled to a network, wherein the storage system having one or more data storage devices containing a plurality of data storage areas, and a controller for controlling the data storage devices, wherein the plurality of data storage areas including a first storage area and a second storage area for storing a copy of data that is stored in the first storage area at one point in time, and wherein the storage system is configured to delete, only when the differential amount is smaller than the predetermined threshold, the data stored in the second storage area and newly store a copy of the data stored in the first storage area in the second; and a backup judging module, wherein the backup judging module is configured to judge whether or not a differential amount indicating a difference between data stored in the first storage area and data stored in the second storage area is smaller than a predetermined threshold, and wherein the backup judging module is further configured to: