NetWorker: Staging Fails for Block Based Backup

During the staging operation, the process failed in the "NSRCLONE_PROCESSING_PHASE_TWO" stage while attempting to obtain the Save Set ID and Clone ID information. The workflow identified the save set as a Block Based Backup (BBB).
As a result, the save set was skipped, and the job failed with the following message. This indicated that no eligible save sets were available for staging.

8/13/2026 12:30:38 PM Migration (staging) is not supported for Block Based Backup save set 4193561755.

8/13/2026 12:30:39 PM No valid input savesets - check CLONE SKIPPED SAVESETS!

This issue is due to a known NetWorker product limitation. The save set is a Block Based Backup (BBB) save set. NetWorker does not support the staging or migration of BBB save sets to other volumes. Since the staging operation selected a BBB save set, NetWorker skipped it, resulting in no valid save sets being available for processing.

Staging or migration operations are not supported for Block Based Backup (BBB) save sets due to a product limitation in NetWorker. The staging operation uses the following command: nsrclone -m

As an alternative, perform a standard clone operation to copy the BBB save set to the required target volume or pool. This creates an additional copy of the save set while retaining the original copy.

If the objective is to move the data permanently from the source volume, NetWorker does not provide a supported staging or migration method for BBB save sets. The closest alternative is to create a clone copy and subsequently allow the original save set to expire according to retention policies. However, this does not provide the same functionality or guarantees as a staging operation.

Refer to the following Dell NetWorker resources:

• NetWorker: Introduction to Save Set Cloning
  • Video: Introduction to Saveset Cloning in NetWorker
• NetWorker Administration Guide (requires Dell account sign-in). Support for NetWorker | Manuals & Documents
  • This guide contains detailed documentation on save set management. It includes the section "Staging save sets from the command prompt," which covers staging and cloning operations, supported scenarios, and operational considerations.

These resources provide information on the differences between cloning and staging. They also describe the limitations associated with Block Based Backup (BBB) save sets.