* Barracuda Backup Servers running firmware 5.0 and higher
The most common cause for this error is a virtual machine that has 'crashed' or has missing blocks.
The vsphere logs will show entries like these:
Error backing up disk: Error QueryChangedDiskAreas
To resolve this issue:
- Remove any snapshots for the virtual machine.
- Disable Changed Block Tracking.
- Re-enable Changed Block Tracking.
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