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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.
Disk cloning software facilitates a disk cloning operation by using software techniques to copy data from a source to a destination drive or to a disk image. List
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 ...
Disk cloning is the process of duplicating all data on a digital storage drive, such as a hard disk or solid state drive, using hardware or software techniques. [1] Unlike file copying, disk cloning also duplicates the filesystems, partitions, drive meta data and slack space on the drive. [2]
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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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.
To avoid downtime, high-availability systems may instead perform the backup on a snapshot—a read-only copy of the data set frozen at a point in time—and allow applications to continue writing to their data. Most snapshot implementations are efficient and can create snapshots in O(1). In other words, the time and I/O needed to create the ...