| 主权项 |
1. A method for backing up data on a tape in a file system, the data being stored on the tape as a single file including a first data area and a second data area separate from the first data area, the data in the second data area corresponding to data in a third data area, which is a changed portion of the data in the first data area, and each data area being managed using index information including the start positions of data on the tape and length information, the method comprising:
copying the data area in the first data area, excluding the third data area, as well as in the second data area to the tape as a single, contiguous fourth area; copying the second data area to a position corresponding to the replacement of the third data area; storing index information for identifying the fourth data area to the tape; copying the third data area to the tape as a fifth data area separate from the fourth data area; and storing on the tape the index information for identifying the data area in the fourth data area excluding the second data area, and the index information for identifying the fifth data area. |
