How to get here in the GigaVaultStorage Web Console?
 In the top menu, select: "Backup->Add Backup Schedule" and choose the "system state" entry in the tree in step2

System State/Active Directory Backup is configured like any files and folder backup from the "Add Backup Schedule" page. All you have to do is to choose the "System State" entry in the tree and configure the backup. Read the "Add Backup Schedule" help for more details.