Patent ID: 9720779
Date: 2017-08-01
CPC Classifications: G06F

Claim:
1. A backup system, comprising: an operational storage; a backup storage, comprising a first backup storage unit and a second backup storage unit; a service client communicated with the operational storage, being configured to access the operational storage according to an operational storage layout metadata corresponding to the operational storage, to make a data change to the operational storage and to transmit a metadata update request by according to the data change made to the operational storage; a backup client coupled with the operational storage and the backup storage respectively; and a metadata server communicated with the service client and coupled with the backup client, wherein when the metadata server receives the metadata update request from the service client, updates a local operational storage layout metadata in response to the data change according to the metadata update request, acknowledges the metadata update request and instructs the backup client to back up the data change of the operational storage to the backup storage according to the metadata update request; wherein the backup client backs up the operational storage by reading data change from the operational storage and then writing the read data change into the first backup storage unit and then moving cold data from the first backup storage unit to the second backup storage unit.