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Windows file system backups fail with ACCESS_VIOLATION errors in the logs. Example log entries: ERROR: nbackmain - Windows structured exception ACCESS_VIOLATION in threadID 3656 ERROR: threadimpl::runthread() - Windows structured exception ACCESS_VIOLATION in threadID 8380
ACCESS_VIOLATION errors can occur due to: Avamar attempting to inflate Office XML files during backup Windows client software running an older version than the Avamar grid Antivirus software locking files during backup Other client-specific issues (such as, Hyper-V, SQL backups)
Disable Office XML Inflation Create an avtar.cmd file in: C:\Program Files\avs\var Add the following flag: --inflateofficexml=false This prevents Avamar from decompressing Office XML files before backup Update Avamar Client Software Ensure that the Windows client version matches the latest version available on the Avamar grid Download updates from the Avamar server’s Documents and Downloads page Check Antivirus Interference Verify that antivirus scans do not overlap with scheduled backups Exclude Avamar processes or backup directories from real-time scanning if necessary Escalate if Issue Persists For unresolved cases, contact Dell Support and reference this KB article
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