Synthetic full backup failures: common causes
Overview
Synthetic fulls rebuild fulls from incrementals—fast until chain corruption strikes.
Common causes
Underpowered repository during transform; interrupted jobs; antivirus locking backup files.
Triage
Run integrity check per vendor; temporarily switch to active full to stabilize chain.
Prevention
Dedicated backup network VLAN; exclude repo paths from on-access AV per vendor doc.
Communication
If chain compromised, inform client of full baseline window impact early.
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