Patent ID: 8745006

Claim:
A computing system comprising: a remote copy source storage system; and a first and a second remote copy destination storage systems, wherein, the remote copy source storage system includes: a first volume accessed by a host computer; and a second volume, wherein a local copy pair is set between the first volume and the second volume, each of the remote copy destination storage systems includes a remote copy destination volume, wherein a synchronous remote copy pair is set between a first remote copy destination volume in the first remote copy destination storage system and the second volume, and an asynchronous remote copy pair is set between a second remote copy destination volume in the second remote copy destination storage system and the second volume and, before executing a copy from the first volume to the second volume in the remote copy source storage system, the remote copy source storage system suspends a remote copy from the second volume in the remote copy source storage system to the first remote copy destination volume in the first remote copy destination storage system to create a first determined backup volume in the first remote copy destination storage system and, after the execution of the copy from the first volume to the second volume in the remote copy source storage system, the remote copy source storage system copies differential data from the second volume in the remote copy source storage system to the second remote copy destination volume in the second remote copy destination storage system to create a second determined backup volume in the second remote copy destination storage system.