About supported snapshot technologies
To use snapshot technologies with Backup Exec, you must install the Advanced Open File Option (AOFO). After making backup selections and selecting AOFO, you can configure Backup Exec to use the snapshot technologies installed on your computers.
Backup Exec supports the following snapshot technologies:
Table: Supported snapshot technologies
On Windows 2000/XP 32-bit
Symantec Volume Snapshot Provider (VSP)
Symantec Volume Snapshot Provider (VSP) is installed when you install AOFO.
On Windows 2000/2003
Veritas Storage Foundation™ by Symantec, formerly known as Veritas Volume Manager (VM), FlashSnap Option
On Windows Server 2003 and later
Microsoft Volume Shadow Copy Service (VSS)
Third party software vendors also provide additional components that work in conjunction with the Microsoft Volume Shadow Copy Service. These components, called Writers, are used to flush application data or file data (if a file is open) residing in the computer's memory before the Microsoft Volume Shadow Copy Service makes a snapshot of the volume to be backed up. See your software documentation for information about VSS Writers that may be provided by the application software vendor.
For Windows Vista/Server 2008, VSS is always used by default.
If you turn off Active Directory, Microsoft Volume Shadow Copy Service (VSS) is not available. Jobs that require VSS fail.
See Setting default options for the Advanced Open File Option
See Advanced Open File Option wizard
See Using Snap Start on a Veritas Storage Foundation volume
See Best practices for using the Symantec Volume Snapshot Provider
See About the Symantec Volume Snapshot Provider cache file location