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[V7] ISSUE: AhsayOBM/AhsayACB v7 file backup jobs ends with "Snapshot for Shadow Copy Set is missing, backup terminate." error

Article ID: 5246
Reviewed: 2017-06-19

Product Version:
AhsayOBM/AhsayOBM: to 7.x
OS: Windows

ATTENTION 1st January, 2022: v7 officially End-of-Life [details]

Problem Description

When perform a file backup up on AhsayOBM/AhsayACB v7 the job ends with "Snapshot for Shadow Copy Set is missing, backup terminate." error.

No. Type Timestamp Log
* ... ... ...
* erro YYYY/MM/DD hh:mm:ss Snapshot for Shadow Copy Set is missing, backup terminate.
* info ... ...


The error message is returned by the Microsoft Windows Volume Shadow Copy Service (VSS).

To support backups of volume mount points on Windows file backup sets on AhsayOBM/AhsayACB v7, if "Volume Shadow Copy" option is enabled , AhsayOBM/AhsayACB v7 will initiate a VSS snapshot of all local drives found on the machine regardless if the drive has been selected in the backup source.

This behavior different from AhsayOBM/AhsayACB v6 which only initiates a VSS snaphot of a local drive selected in the backup source.


If the client machines are not configured with volume mount points and there are persistent "[Shadow Copy] Snapshot for Shadow Copy Set is missing, backup terminate." backup errors.

As a workaround you could consider reverting the current AhsayOBM/AhsayACB v7 VSS snapshot behavior back v6, this can be done by:

  1. Editing the %OBC_INSTALLL_PATH%\ cb.opt file

    # Set option to true for disabling adding all volumes to shadow copy set

  2. Restart AhsayOBM/AhsayACB scheduler service.


VSS, Volume Shadow Copy Service, volume mount point

public/5246_issue/ahsayobm_ahsayacb_v7_file_backup_jobs_ends_with_snapshot_for_shadow_copy_set_is_missing_backup_terminate._error.txt · Last modified: 2021/12/16 05:12 by anna.olalia