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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 Online Backup Client 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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