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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.
System Restore. System Restore is a feature in Microsoft Windows that allows the user to revert their computer's state (including system files, installed applications, Windows Registry, and system settings) to that of a previous point in time, which can be used to recover from system malfunctions or other problems.
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 ...
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.
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]
NTBackup (also known as Windows Backup[1]: 20.1 and Backup Utility[1]: 20.4 ) is the first built-in backup utility of the Windows NT family. It was introduced with Windows NT 3.51. NTBackup comprises a GUI (wizard-style) and a command-line utility to create, customize, and manage backups. It takes advantage of Shadow Copy (to create backups ...
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.