To reset Changed Block Tracking (CBT) for a VMware virtual machine (VM):
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In the Management Console of the Backup & Disaster Recovery appliance, go to Clients › VMware.
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Select a VM you want to reset CBT for.
CBT can be reset only for those VMs that are registered, powered on, do not have snapshots, and have CBT allowed).
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On the toolbar, click Advanced, and then click Reset CBT.
After the system finishes resetting CBT, it will show a dialog box with confirmation.