5.6. Windows XP and Windows Server 2003 Volume Shadow Copy Service
With Windows XP and Windows Server 2003, Microsoft has implemented the volume shadow copy service to provide a framework that allows a coordinated and consistent point-in-time copy of disk volumes. For legal reasons, Microsoft has chosen to refer to the functionality as a volume shadow copy, which is really no different from the more popularly known term, snapshots. Volume shadow copy service has been implemented via a filter driver (called volsnap.sys) beneath the file system.
Microsoft makes a volume shadow copy software development kit available on a nondisclosure basis. This SDK appears to be aimed at three broad categories:
ISVs who might wish to develop volume shadow copy ...
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