Patent ID: 7797284

Claim:
A storage system, comprising: one or more network interfaces configured to communicate with one or more clients; one or more processors coupled to the network interfaces and configured to execute one or more processes; one or more storage devices configured to contain stored data for the one or more clients; and a memory configured to store an operating system having threads executable by each processor, the operating system having one or more session threads configured to backup the stored data of a corresponding client to a backup storage device, and generate backup history of stored data backed up to the backup storage device, wherein the backup history is file history of the stored data backed up to the backup storage device, and a worker thread configured to obtain the backup history from the one or more session threads, transmit the backup history to the corresponding client of each of the one or more session threads, and wait for a response that acknowledges receipt of the backup history from the corresponding clients while the one or more corresponding session threads continue to backup the stored data and generate backup history without waiting for the response from the corresponding clients.