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Do useful things with the volume shadow copy service (VSS)

The Volume Shadow Copy Service (VSS) takes a snapshot of an NTFS drive at a point in time. The clever thing about VSS is that it doesn't copy anything — it starts with the assumption that nothing has changed and then keeps track of every change to the snapshot so only changes need to be stored.

From Windows Vista on it's possible to mount a shadow copy as a drive letter or share. ShadowTask is a command line tool that creates a VSS copy, mounts it as a drive and then runs a program or batch file. For example:

ShadowTask C V dostuff.bat

Creates a copy of C:, mounts it as V: and then runs dostuff.bat.

Let's say you want to copy a locked file — maybe some outlook personal folders. Dostuff.bat could contain:

copy V:\Users\You\AppData\Local\Microsoft\Outlook.pst C:\Users\You\Desktop\OutlookBackup.pst

Bingo, you have a copy of your PST without shutting down Outlook.

Download: ShadowTask.zip (50.86 kb)

The ZIP contains both 32 and 64 bit versions of the tool. You must use the version that matches your platform. ShadowTask supports Windows Vista and 7. XP doesn't support mounting a shadow copy so ShadowCopy will fail if you try to use it on XP. ShadowCopy must run as admin (elevated).

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