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Volume Shadow Copy how it works

Starting from the versions Windows XP and Windows Vista Microsoft include a technology called Volume Shadow Copy or VSS. Volume Shadow Copy allows backing up files that are open or not in use. The Backup Manager uses Volume Shadow Copy to create a virtual copy of your files before a backup begins. It allows back up files in a consistent state even if they are open. After the backup has completed, the virtual copy is removed and the original file stays intact.

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