A potential for data loss has been discovered with NetBackup 6.5.4 and 6.5.5 when performing optimized duplication of NetBackup Granular backups (SharePoint, Exchange or Active Directory) from one PureDisk/PDDO location to another.


A potential for data loss has been discovered with NetBackup 6.5.4 and 6.5.5 when performing optimized duplication of NetBackup Granular backups (SharePoint, Exchange or Active Directory) from one PureDisk/PDDO location to another. Other OpenStorage (OST) configurations are not affected if used in a supported manner.


Optimized duplication is a feature that allows for better performance when duplicating backups between OpenStorage (OST) appliances of the same type.  If this feature is used with SharePoint, Exchange or Active Directory (AD) granular backups, the duplication will fail but report Status 0 (success).   This issue can occur when duplicating manually or with any other method that allows optimized duplication, such as Vault or Storage Lifecycle Policies (SLP).  Granular recovery is enabled if "Enable Granular Recovery" is checked in the Backup Policy.

What is affected:
The following versions of NetBackup are affected by this issue, on all supported platforms:
  • - NetBackup Server/Enterprise Server 6.5.4
    - NetBackup Server/Enterprise Server 6.5.5

How to determine if affected:
Data loss can occur if ALL of the following conditions are met:
  • - Granular Backups are enabled for SharePoint, Exchange or Active Directory (AD)
    - Backups of this type exist at an OpenStorage (OST) location *
    - A duplication job is attempting to copy the data to the same type of OST storage unit device, both supporting optimized duplication.
    - Optimized duplication is performed manually, or with Vault, Storage LifeCycle Policies or any other method for one or more of these backups.
      • Example: A duplication from one PDDO Storage unit to another.
    - This duplication is initiated by a Master Server, Media Server or Admin/Java Console running NetBackup 6.5.4 or 6.5.5.
    - This duplication is later needed for restore, but was not written due to this issue.

The job details in the Activity Monitor for such a job will appear as follows:
  • 8/5/2009 8:55:05 PM - granted resource DR_STU
    8/5/2009 8:55:09 PM - Info Duplicate(pid=3692) Initiating optimized duplication from @aaaaf to @aaaaq      
    8/5/2009 8:55:09 PM - end Duplicate; elapsed time: 00:00:06
    the requested operation was successfully completed

* An optimized duplication of a granular backup is required to reproduce this issue.  PureDisk / PDDO (PureDisk Deduplication Option) is the only Storage Type that supports both Granular backups and optimized duplications.  If optimized duplications are attempted with unsupported OpenStorage (OST) types, this issue may be seen.  However, it is not recommended that granular backups be stored on OpenStorage destinations other than PureDisk / PDDO as this is not a supported function.  

A workaround is not currently available for this issue.  If affected and an upgrade is not possible for any reason, please call Technical Services (Referencing this TechNote (334806) and Etrack 1788500) to obtain an engineering binary.

Formal Resolution:
Symantec has acknowledged that the above-mentioned issue (Etrack 1788848) is present in the current version(s) of the product(s) mentioned at the end of this article. Symantec Corporation is committed to product quality and satisfied customers.
This issue is currently being considered by Symantec Corporation to be in the following Release Update of the product:
  • -  NetBackup Server/Enterprise Server 6.5.6

Note:  Whether a formal fix or an engineering binary is applied, ensure that the fix is applied to ANY Master Servers, Media Servers or Admin Consoles that would initiate a duplication.

Best Practices:
Symantec strongly recommends the following best practices:
  • 1. Always perform a full backup prior to and after any changes to your environment
    2. Always make sure that your environment is running the latest version and patch level
    3. Perform periodic "test" restores
    4. Subscribe to technical articles / alerts

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