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System state data is comprised of the following files:
Boot files, including the system files, and all files protected by Windows File Protection (WFP).
Active Directory (on a domain controller only).
Sysvol (on a domain controller only).
Certificate Services (on certification authority only).
Cluster database (on a cluster node only).
The registry.
Performance counter configuration information.
Component Services Class registration database.
The system state data can be backed up in any order. Restoration of the system state replaces boot files first and commits the system hive of the registry as a final step in the process.
System state backup and restore operations include all system state data: you cannot choose to backup or restore individual components due to dependencies among the system state components. However, you can restore system state data to an alternate location in which only the registry files, Sysvol directory files, and system boot files are restored. The Active Directory database, Certificate Services database, and Component Services Class Registration database are not restored to the alternate location.
Although you cannot change which components of the system state are backed up, you can back up all protected system files with the system state data by setting advanced backup options.
Reference : - http://technet.microsoft.com/en-us/library/cc938537.aspx
