NetWorker 8.0 VMware Integration Guide中有下面一段说明：
Performing a backup using VMware VADP creates a crash-consistent snapshot of a virtual
machine image. However, advanced VMware functionality allows a backup application
using VADP to achieve application-level consistent backups.
When performing a full VMware backup using VADP, in addition to VM quiescing, vSphere
version 4.1 and later provides application quiescing using VSS on Windows 2008 and
later platforms. This functionality requires that VMware tools is installed on the VM guest.
If VMware tools is not installed, there is no backup integration with the VSS framework
and backups are considered crash-consistent.
我认为这一些特定的系统版本上vmware的快照是可以调用VSS来保持应用程序的一致性的。但受限于VMware tools的支持，所以只是windows 2008 and later 平台可以