Microsoft adds "Previous Versions" support on the file system level
When is a deleted file really deleted? With Windows Vista, that answer gets complicated.
Microsoft recently revealed that Windows Vista would inherit "volume shadow copy" technology from Windows XP and Windows Server 2003. In those older operating systems, volume shadow copy is used to take periodic snapshots of key system files, though the service can also be instructed to monitor any kind of data for the purposes of creating a system "restore point."
At Ars Technica.
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