Article ID: kb10130Last Modified: 16-Oct-2026

Cannot Restore Deduplicated File(s) (code 2051)

Situation

A restore plan finishes with the following warning: Cannot restore deduplicated file(s). Failed to restore some deduplicated files. Number of files were not restored.

Cause

This occurs due to an unexpected error in deduplication.

Solutions

Solution 1

To prevent this issue, the selected restore target (Mount Server) should use the same or a later guest OS version than the VM that was backed up.

Select a different Mount Server running the same or newer OS version than the original VM that was backed up or upgrade the selected Mount Server OS.

If this is not the case, use Solution 2 below.

Solution 2

Since the cause of the warning cannot be determined automatically, collect the Windows Application, Deduplication Diagnostic, and Deduplication Operational logs, then contact the MSP360 technical support team.

To do this, proceed as follows:

  1. Open the Event Viewer.
  2. Click Applications and Services Logs.
  3. Click Windows.

  1. Click Deduplication.
  2. Right-click Operational.
  3. Select Save All Event Logs As... and save the .evtx file to a known location.

  1. Right-click Diagnostic.
  2. Select Save All Event Logs As... and save the .evtx file to a known location.
  3. Click Windows Logs.
  4. Click Application.
  5. Select Save All Event Logs As... and save the .evtx file to a known location.
  6. Send these logs to the MSP360 technical support team: open the https://support.msp360.com/ website.
  7. Click Open a Case.
  8. Fill in all required fields and give a detailed description of the issue. Click Next.

  1. Take a look at the Knowledge Base materials related to your issue. You may find that you do not need to submit a ticket and can fix the issue on your own. If it doesn't help, click Next.
  2. Attach the saved log files from step 4.

  1. Click Create Case. You will be contacted shortly.