Patent ID: 7356657

Claim:
A storage control method, which is realized in a system comprising a logical volume, and an access request source for the logical volume, the storage control method comprising the steps of: updating a first logical volume each time a write request is issued from the access request source, by writing data contained in the issued write request to said first logical volume; transitioning to a snapshot mode; monitoring the state related to securing the length of time for backup execution, and when it comes to a state where securing the length of time for backup is more difficult than a certain state due to a reduced backup window, which is the length of time during which the access request source can be halted or staticized, transitioning to a journal mode in place of the snapshot mode; when in said snapshot mode, acquiring, either at regular or irregular intervals, a snapshot of said first logical volume for a second logical volume at the point in time of backup execution, and taking the snapshot in said second logical volume as restoration data when executing restoration; and when in said journal mode, writing a journal which is a write log comprising the data in said write request, to a third logical volume each time said write request is issued, and acquiring a backup, to which the data in the journal written to said third logical volume is applied when executing restoration.