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

Claim 9:
10. A backup server comprising:
a network interface for accessing a network;
a memory storing executable instructions; and
a processor configured to execute the executable instructions to:
send a snapshot request to a file server;
receive a snapshot creation success response returned by the file server, wherein the response includes a snapshot identifier of a second snapshot;
after a data backup operation is triggered, send a change information obtaining request to the file server to request for change information of data in the file server;
receive, from the file server, a record of a data change between the second snapshot and a first snapshot taken before the second 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;
obtain, from the file server based on the data change record, data in the data block identified by the identification information of the data block;
store the obtained data in a backup storage device; and
establish a data mapping relationship for the data 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.