Incremental backup promoted to a full after a live migration failure for a Hyper-V VM

SUMMARY

This article explains why incremental backups are promoted to full backups after a live migration failure.

ISSUE

If a live migration for a Hyper-V VM fails but the owner node changes, the Hyper-V CBT driver cannot compare changes on the VM with its snapshot entries.  As a result, the next incremental backup is promoted to a full.  Subsequent incremental backups run as scheduled. 

 

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