Patent ID: 11907078
Assignee: HUAWEI TECHNOLOGIES CO., LTD.
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 5:
6. A data backup method performed by a backup server, comprising:
after a data backup operation is triggered, sending a change information obtaining request to a file server to request for change information of data in the file server, wherein the change information obtaining request comprises a snapshot identifier of a second snapshot and a snapshot identifier of a first snapshot made before the second snapshot;
receiving, from the file server, a record of a data change between the second snapshot and the first snapshot, wherein the data change record records information about a data block corresponding to the data change between the second snapshot and the first snapshot, and the data change record includes identification information of the data block corresponding to the data change;
obtaining, from the file server based on the data change record, data in the data block identified by the identification information of the data block;
storing the obtained data in a backup storage device; and
establishing a data mapping relationship for the backup operation, wherein the data mapping relationship includes identification information of all data blocks in the second snapshot, storage locations of all the data blocks in the second snapshot in the backup storage device, and a snapshot identifier of the second snapshot.