Performing a differential backup on a Windows ReFS (Resilient File System) can result in data loss.

  • Article ID:100000484
  • Last Published:
  • Product(s):NetBackup


Data Loss


Under a specific set of circumstances, it is possible that a differential backup performed on an ReFS file system may not recognize that any files have changed, resulting in an empty backup.

What is Affected: This issue affects all currently supported versions of NetBackup, including NetBackup 8.0.

How to determine if Affected: This issue may be experienced when ALL of the following conditions are met:
  • The following attributes are enabled on the Policy:
    • Backup selections include ReFS (Resilient File System) path(s)
    • Use Change Journal
    • Multistreaming
    • Accelerator
  • Messages similar to the following (including a path to a snapshot link) may appear in the File List of the Job Details for affected policies:
    BACKUP E:\testdata1\ USING \\?\GLOBALROOT\Device\HarddiskDmVolumes\DataDG1\SnapV593EFDD402E7\testdata1\ OPTIONS:ALT_PATH_PREFIX=C:\Program Files\Veritas\NetBackup\temp\_vrts_frzn_img_7728_1,​FITYPE=MIRROR,MNTPOINT=E:\,​ FSTYPE=ReFS

Action Required

If this issue is experienced, please contact Veritas technical support, referencing this document and Etrack 3918070 to determine Emergency Engineering Binary (EEB) availability.

This issue was expected to be resolved in the next version of NetBackup.

When the next release of NetBackup is available, please access the following link for download and README information:

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