What is Volume Shadow Copy Service-based backup?


Margaret Rouse of WhatIs.com has published an article titled “What is Volume shadow Copy Service-based backup?” that we at Revelation Software would like to share so that you can take advantage of the full potential of the Universal Driver NUL 5.0.

A Volume Shadow Copy Service-based backup (VSS-based backup) is a Windows service that captures and creates snapshots called shadow copies. VSS, also known as Volume Snapshot Service, operates at the block level of the file system and enables virtual server backup in Microsoft environments.

In addition to the service itself, Windows VSS has three major components:

VSS writer: Each VSS-aware application installs its own VSS writer to a computer during the initial installation. The VSS writer tells the backup tool how to back up the application and its data. VSS writers are commonly included within database-driven applications such as Active Directory or Exchange Server. Database servers such as Microsoft SQL Server also contain VSS writers.

VSS requestor: The VSS requestor initiates the backup process. Any application that needs to quiesce data for capture can play the role of VSS requestor. In a majority of cases the backup application acts as the VSS requestor.

VSS provider: VSS providers allow the VSS backup process to work with the system’s hardware and operating system (OS). Providers are modular, and a single system often contains multiple providers. OS providers allow VSS to be operating system-aware. Similarly, hardware providers act as a proxy between the VSS service and hardware components such as storage arrays. For example, a storage-level hardware provider may create the snapshot used during the backup process.

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