| 摘要 |
When backing up data on tape, the present invention eliminates or reduces degradation in performance at the time of reading out an edited file, while retaining a data history. The present invention provides a method for backing up data on tape in a file system. The method includes: a step for copying a data area in a first data area, except a third data area, and a second data area as a fourth contiguous data area to a tape, in which step the second data area is copied to a position equivalent to a replacement of the third data area; a step for storing, on the tape, index information for specifying the fourth data area; a step for copying the third data area to the tape as a fifth data area set apart from the fourth data area; and a step for storing, on the tape, index information for specifying a data area in the fourth data area, except the second data area, and index information for specifying the fifth data area. |
