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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.
[3] [4] An updated version of System Restore introduced by Windows Vista uses the Shadow Copy service as a backend (allowing block-level changes in files located in any directory on the volume to be monitored and backed up regardless of their location) and allows System Restore to be used from the Windows Recovery Environment in case the ...
This service runs independent of user sessions and can perform scheduled backups even when no users have logged onto the system. Scheduled backups, by default, run every Sunday at 7 P.M. [5] 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]
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.
Once the original backup file is created Volume Shadow Copy Service updates changes, subsequent full backups take a matter of moments rather than many minutes taken to create the original backup file. Automatic backups can be scheduled on a regular basis using a wizard. Two kinds of restore operations are supported:
Image for Windows is a disk imaging utility for Microsoft Windows developed by TeraByte Unlimited.When first released in 2002, it was one of two disk imaging software products that could create a consistent point-in-time backup of Windows while Windows was running.
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 ...
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