Item-Level Restore for Volumes with Windows Deduplication

This article covers the following topics:

  • Item-Level Restore Support for Volumes with Windows Deduplication
  • Windows Deduplication Explained.

Item-Level Restore for Volumes with Windows Deduplication

Starting from version 6.3.2, Backup for Windows supports item-level restore of Windows deduplicated volumes.

Note: at the moment, the item-level restore is supported for volumes with Windows Deduplication only. If your target volume does not support Windows deduplcation, the restore job will fail

What is Windows Deduplication?

Windows deduplication is a feature that reduces the impact of redundant data on storage costs. Once enabled, Windows deduplication the space usage on a volume by excluding duplicated parts on a volume.

Duplicated volume dataset parts are stored once and optionally are compressed for additional savings. Windows deduplication optimizes redundancies without compromising data integrity.

Once enabled for a volume, Windows deduplication runs in the background to:

  • Identify repeated patterns across files on that volume
  • Seamlessly move those portions, or chunks, with special pointers called reparse points that point to a unique copy of that chunk.

This occurs in the following steps:

  1. Scan the file system for files meeting the optimization policy.
  2. Break files into variable-size chunks.
  3. Identify unique chunks.
  4. Place chunks in the chunk store and optionally compress.
  5. Replace the original file stream of now optimized files with a reparse point to the chunk store.

When optimized files are read, the file system sends the files with a reparse point to the Data Deduplication file system filter (dedup.sys).

System Requirements

Windows deduplication works on the following operating systems:

  • Windows Server 2016
  • Windows Server 2019.