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This message will be shown when the incremental backup of Hyper-V VMs is done by scanning the entire VM again. The entire VM will be scanned to run the incremental backup if the Vembu's CBT driver failed to track the incremental changes. The driver failure might happen due to the following reasons:

• CBT driver got reset in the host

• NTpath or GUID of the disk which hosts Hyper-V VMs disks got changed

• VembuIntegrationService is not installed on any one of Hyper-V cluster nodes

• High availability enabled cluster VMs configured for a backup using Standalone Hyper-V host option of Vembu

• Anyone of the cluster nodes is not reachable/power off

This message will also be shown whenever the ownership of the CSV gets changed.