In order to create, at another site, a backup of a volume at a specific time point while minimizing the response time required to update the volume, a first storage apparatus and a second storage apparatus transfer a journal in a first journal volume to the second storage apparatus, the second storage apparatus writes the transferred journal into a second journal volume, the second storage apparatus reads journals in the second journal volume in order of the update, the second storage apparatus reflects the read journals to a second data volume, the first storage apparatus creates, in the first journal volume, a journal including a marker when a specific condition is satisfied, and the second storage apparatus creates a snapshot of the second data volume upon detecting a marker in the read journal.