Shadow Copy (or the Volume Snapshot Service (VSS)) is a feature in Windows Server 2003 (and Windows Home Server RTM) that allows automated or manual snapshots of files and folders to be taken at specific points in time. (More here). It’s an additional backup feature within Windows Server (and all modern versions of Windows), but is not required for Windows Home Server backups to work.
Some users are very familiar with using VSS on a day to day basis, and if they purchase a HP MediaSmart Server, they will see that the unit ships with Shadow Copy disabled for some reason. Enabling it, however is relatively straightforward.
Step 1: One a home computer, connect to your home server using Remote Desktop Connection and log-in using your Administrator user name and password.