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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.
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 ...
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 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. Continuous data protection (CDP), also called continuous backup or real-time backup, refers to backup of computer data by automatically saving a copy of every change made to that data, essentially capturing every version of the data that the user saves. In its true form it allows the user or administrator to restore ...
NTBackup from Windows XP and newer includes Volume Shadow Copy (VSS) support and thus can back up locked files. In the case of Windows XP Home Edition, NTBackup is not installed by default but is available on the Windows XP installation disc. [8] [9] Windows XP introduced a wizard-style user interface for NTBackup in addition to the advanced UI.
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.
List. Disk cloning capabilities of various software. ^ Sector-by-sector transfer involves accessing the disk directly and copying the contents of each sector, thus accurately reproducing the layout of the source disk. ^ File-based transfer (as opposed to sector-by-sector transfer), involves opening all files and copying their contents, one by ...