| 摘要 |
PROBLEM TO BE SOLVED: To provide a technology capable of estimating a backup processing time of backup object data in difference backup processing.SOLUTION: For instance, backup object data represents a VHD file for attaining a virtual machine, and the VHD file is stored in a storage device of a computer. In a backup function part 300 included in a host OS of the computer, a generation part 310 monitors data update of the VHD file, and when data is updated, records information of a sector where the data has been updated, into update data stored in an update information storage part 380. When performing difference backup processing, a calculation part 320 calculates a prediction value of a time required for the difference backup processing for each virtual machine, on the basis of the number of sectors where the data has been updated that is acquired from recording to the update data. |
