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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.
It creates disk images and file backup archives using Microsoft Volume Shadow Copy Service to ensure 'point in time' data accuracy. Macrium Reflect can back up whole partitions or individual files and folders into a single compressed, mountable archive file, which can be used to restore exact images of the partitions on the same hard disk for ...
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 ...
Perhaps the best known support for this was incorporated into Microsoft Shadow Copies [1] which was introduced in Microsoft Windows Server 2003. For an application to be quiesced during the shadow copy process, it must register itself as a writer [2] and it is responsible for putting itself into a quiescent mode upon notification.
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. This also allows data backup programs to archive files currently in use by the file system.
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]
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 ...
XCOPY will not copy open files. Any process may open files for exclusive read access by withholding the FILE_SHARE_READ [16] XCOPY does not support the Windows Volume Shadow Copy service which effectively allows processes to have access to open files, so it is not useful for backing up live operating system volumes.