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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.
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.
Continuous data protection differs from RAID, replication, or mirroring in that these technologies only protect one copy of the data (the most recent). If data becomes corrupted in a way that is not immediately detected, these technologies simply protect the corrupted data with no way to restore an uncorrupted version.
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 file backup feature also uses shadow copy but stores files inside ZIP files. Beginning with Windows Vista , Shadow Copy is also used by the System Protection component which creates and maintains periodic copies of system and user data on the same local volume (similar to the Shadow Copies for Shared Folders feature in Windows Server) but ...
Robocopy does not copy open files. Any process may open files for exclusive read access by withholding the FILE_SHARE_READ [12] flag during opening. Normally Volume Shadow Copy Service is used for such situations, but Robocopy does not use it. Consequently, Robocopy is not suitable for backing up live operating system volumes.
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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 ...