| 摘要 |
A file is rapidly restored with minimal storage consumption when a file access request is made by the user. When file restoration takes place, a second server apparatus 3b transmits a directory image, which extends from the top directory to a predetermined lower level, of a directory image configured in a file system of a first server apparatus 3a at a date and time associated with a restoration destination directory among the data of files stored in a second storage apparatus 10b, to the first server apparatus 3a, and the first server apparatus 3a restores the directory image to a first storage apparatus 10a. If a request is sent from the first server apparatus 3a, the second server apparatus 3b reads an additional directory image from the second storage apparatus 10b and transmits the image to the first server apparatus 3a.
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