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Source: Microsoft Support
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On a Windows Server 2003 based computer where Veritas backup is running, the hard disk space may rapidly run out. You may find that the <driverletter>:\System Volume Information folder grows quickly.
When a backup of the Shadow Copy Components is run, the Windows VSS service generates cache files that contain the original data that changed during backup. These are also referred as snapshots.
This issue occurs when the backup program does not delete the snapshots.
To work around this issue, please refer to the article that is listed in the More Information section in this article. Symantec has provided a workaround which is to set a maximum size limit of the total storage area that the shadow copies can occupy.
You may also contact Symantec for further assistance or questions about Veritas backup.
Symantec has provided this document for the issue. The document ID is 284154:
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