| 摘要 |
A storing unit stores therein information indicating a chronological order of a plurality of states of an apparatus; information indicating an amount of time needed to execute each of a plurality of commands, causing a forward or backward transition between two of the states; and information indicating an amount of time needed for restoration to, among the states, each state for which a snapshot has been taken, using the snapshot. Based on the information stored in the storing unit, a calculating unit calculates shortest operation paths, each for restoring the apparatus from a restoration origin state to one of the remaining states, and determines one or more snapshots not used in any of the shortest operation paths as deletion targets. |
