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Shadow Copy. Shadow Copy (also known as Volume Snapshot Service, [1] Volume Shadow Copy Service[2] or VSS[2]) is a technology included in Microsoft Windows that can create backup copies or snapshots of computer files or volumes, even when they are in use. It is implemented as a Windows service called the Volume Shadow Copy service.
The Volume Shadow Copy Service (VSS) keeps historical versions of files and folders on NTFS volumes by copying old, newly overwritten data to shadow copy via copy-on-write technique. The user may later request an earlier version to be recovered.
For example, Windows Server 2003 (and later) includes volume shadow service (VSS). [14] [15] VSS takes a snapshot of the drive so that any changes are not written to the snapshot. [16] The snapshot creates a virtual drive called a shadow volume that is backed up (or cloned) by the software.
In NTFS, access to snapshots is provided by the Volume Shadow-copying Service (VSS) in Windows XP and Windows Server 2003 and Shadow Copy in Windows Vista. Melio FS provides snapshots via the same VSS interface for shared storage. [2]
During a backup, Windows uses the Volume Shadow Copy Service (VSS) to ensure that files are not changed while they are being backed up. [13] VSS ensures both file system-level consistency and app-level consistency for apps registered as VSS writers. In Windows Vista and Windows 7, another Windows component called System Restore also uses VSS ...
The point-in-time technology used by Image for Windows consists of using a special driver, named PHYLock, that effectively redirects data being overwritten by Windows to a holding cache. Since Microsoft's introduction of the Volume Shadow Copy Service (vssvc.exe), this technology concept is now generally available to any Windows based backup ...
In Windows Vista and later, System Restore is designed for larger volumes. [14] By default, it uses 15% of the volume's space. [10] File paths monitored – Up to Windows XP, files are backed up only from certain directories. On Windows Vista and later, this set of files is defined by monitored extensions outside of the Windows folder, and ...
Windows Mobility Center. Centralizes the most relevant information related to mobile computing. mblctr.exe. Windows Vista. Security and Maintenance. Centralizes and reports on the status of anti-virus, Automatic Updates, Windows Firewall, and other security-related components of the operating system. Windows XP SP2.