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PASSEDserver / backup_chain_broken
Backup Chain Broken — Incremental Backup Failed
A Veeam incremental backup fails because the previous restore point was corrupted by a storage error. The backup chain is broken, requiring a new active full backup. With 95 VMs, the full backup will take 18 hours and consume 4TB of additional space.
Pattern
BACKUP_FAILURE
Severity
CRITICAL
Confidence
95%
Remediation
Remote Hands
Test Results
| Metric | Expected | Actual | Result |
|---|---|---|---|
| Pattern Recognition | BACKUP_FAILURE | BACKUP_FAILURE | |
| Severity Assessment | CRITICAL | CRITICAL | |
| Incident Correlation | Yes | 5 linked | |
| Cascade Escalation | N/A | No | |
| Remediation | — | Remote Hands — Corax contacts on-site support via call, email, or API |
Scenario Conditions
Veeam forever-forward incremental mode. Backup chain for 'SQL-Prod' broken at restore point from 2 days ago. CRC mismatch in VBK file. No recent active full. SureBackup verification last ran 2 weeks ago.
Injected Error Messages (1)
Veeam backup chain broken for job 'SQL-Prod-Backup' — Error: backup chain is broken, restore point 2026-03-27 corrupted (CRC mismatch in VBK metadata), incremental backup cannot proceed, active full required, estimated time: 18 hours, SureBackup validation: FAILED
Neural Engine Root Cause Analysis
The Veeam backup chain for 'SQL-Prod-Backup' job has been corrupted due to a CRC mismatch in the VBK (full backup) metadata from restore point 2026-03-27. This corruption prevents incremental backups from proceeding as they depend on the integrity of the backup chain. The SureBackup validation failure confirms the backup data is unusable for restore operations, creating a critical data protection gap that requires a new active full backup to re-establish the chain.
Remediation Plan
1. Immediately initiate an active full backup for the 'SQL-Prod-Backup' job to create a new baseline and restore backup chain integrity. 2. Move or delete the corrupted backup files (VBK from 2026-03-27) from the repository after confirming the new full backup completes successfully. 3. Investigate underlying storage infrastructure for potential hardware issues, disk errors, or network connectivity problems that may have caused the corruption. 4. Review Veeam backup repository health and consider running integrity checks on the storage system. 5. Monitor the new backup chain for 2-3 cycles to ensure stability before considering the issue resolved.
Tested: 2026-03-30Monitors: 1 | Incidents: 1Test ID: cmncjjbmb01xgobqemgmutgpu