VSS Writers and their controlling services

The following list shows the VSS Writers required for each backup type, as well as the name of the controlling service.

Backup Type	Required VSS Writer	Name of Controlling Service	Service Display Name
System State	ASR Writer	VSS	Volume Shadow Copy
	BITS Writer	BITS	Background Intelligent Transfer Service
	COM+ REGDB Writer	VSS	Volume Shadow Copy
	IIS Config Writer	AppHostSvc	Application Host Helper Service
	IIS Metabase Writer	IISADMIN	IIS Admin Service
	Registry Writer	VSS	Volume Shadow Copy
	System Writer	CryptSvc	Cryptographic Services
	WMI Writer	Winmgmt	Windows Management Instrumentation
	NTDS Writer	[unknown]	Active Directory
	Shadow Copy Optimization Writer	VSS	Volume Shadow Copy
Microsoft Exchange	Microsoft Exchange Writer	MSExchangeIS	Microsoft Exchange Information Store
Hyper-V	Microsoft Hyper-V VSS Writer	VMMS	Hyper-V Virtual Machine Management
Microsoft SQL Server	SQL Server VSS Writer	SQL Server VSS Writer	SQL Server VSS Writer
	MSDE Writer	MSDE Writer	MSDE Writer
Sharepoint	Sharepoint VSS Writer	Sharepoint VSS Writer	Sharepoint VSS Writer
Sharepoint 2007	SPSearch VSS Writer	Windows Sharepoint Services Search	SPSearch VSS Writer
Sharepoint 2007	OSearch VSS Writer	Office Sharepoint Services Search	OSearch VSS Writer
Sharepoint 2010	SPSearch4 VSS Writer	Sharepoint Foundation Search V4	SPSearch 4 VSS Writer
Sharepoint 2010	OSearch14 VSS Writer	Sharepoint Server Search 14	OSearch VSS Writer