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Product Version: 7.0
Last Modified: 2 Mar 2017


An error message is stating that the source VMware host did not provide valid CBT data for a VM and that the proprietary change tracking technology will be used.


After the initial (full) VM backup or replication, all consequent job runs are forever incremental.
By default, NAKIVO Backup & Replication uses VMware CBT or Hyper-V RCT technologies to identify what data has changed since the last job run.

Several factors – such as a power outage – can cause VMware CBT to reset and lose a track of incremental changes for a VM. 
The above error message appears in case the CBT/RCT error handling is set to switch proprietary change tracking technology.


If the problem persists, try editing the job and setting a different error handling in Step 5 of VM backup jobs and VM replication jobs.

You can also reset CBT for the VMware VM manually.


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