Restoration control apparatus and method thereof

A method executed by a restoration control apparatus for restoring, in accordance with backup information including backed up data, a status of data arrangement on a destination storage device to a backup state representing a status of data arrangement on a source storage device before the backed up data has been backed up, the method comprising:

• determining by the restoration control apparatus, during restoration, whether a first storage area on the destination storage device preserves prior data, the first storage area being to be restored with the backed up data;
• storing, upon determining that the first storage area does not preserve prior data, the backed up data in the first storage area;
• and
• storing, upon determining that the first storage area preserves the prior data, the backed up data in an unused second storage area on the destination storage device or copying the prior data preserved in the first storage area to the second storage area to store the backed up data in the first storage area.

A non-transitory computer-readable storage medium storing a program causing a computer for restoring, in accordance with backup information including backed up data, a status of data arrangement on a destination storage device to a backup state representing a status of data arrangement on a source storage device before the backed up data has been backed up to execute:

• determining, during restoration, whether a first storage area on the destination storage device preserves prior data, the first storage area being to be restored with the backed up data;
• storing, upon determining that the first storage area does not preserve prior data, the backed up data in the first storage area;
• and
• storing, upon determining that the first storage area preserves the prior data, the backed up data in an unused second storage area on the destination storage device or copying the prior data preserved in the first storage area to the second storage area to store the backed up data in the first storage area.