Restored files using the Hyper-V plugin are corrupted or empty (4373826)

Restored files using the Hyper-V plugin are corrupted or empty

When attempting to recover individual files from a Hyper-V incremental backup saveset, the restored files are empty or corrupted. The file size will be same as the original one, but when opening the file, no content is displayed, and if it does, garble will be displayed.

File restore from full backup savesets complete successfully, so they are not affected.

Issue has been primarily identified when using Hyper-V 2016, but there has been Cases indicating that it could also happen with other versions of Hyper-V.

The issue has been identified as defect NV-3778

We continually evaluate all customer reported defects in an ongoing effort to improve NetVault. A list of Resolved Issues and New Features is published in the product Release Notes accompanying new versions that can be referenced to identify if a fix for this defect has been implemented. Product Release Notes are available in the release notes and guides on the Quest Support Portal. For more information on our Product Enhancements and Defects policy, see details published in our Global Support Guide.

Workarounds

• If recovering the file is necessary, run a job that will restore the entire VM from the required saveset (full or incremental). File can then be copied from this new VM instance.
• Backup the critical files using the File System plugin:
  • Instead of protecting the system using the Hyper-V plugin, Install NetVault Client on the VM and back up any critical file using the File System plugin. A license might be require to run NetVault Client on the VM.
  • As an alternative, create a network share of the critical directories. Back them up as network shares using the File System plugin on the NetVault Server. No additional license is required to perform the backup.

UPDATE

A patch has been released to address this issue. Please download and install it on the Hyper-V servers where NetVault backup and restore  jobs need to run.

NV-3778