Symptom
You may get the following message in the vsbkp log during the full backup:
Entire disk is allocated.
The size of the full backup increases when you get this message.
Resolution
Use the CheckChangeTracking utility to reset change tracking. Follow the commands given below:
CheckChangeTracking /host x-vcenter /user branzini /password Brown010 /vm iks-dc1.iks.it /disable
CheckChangeTracking /host x-vcenter /user branzini /password Brown010 /vm iks-dc1.iks.it /enable
CheckChangeTracking /host x-vcenter /user branzini /password Brown010 /vm iks-dc1.iks.it
It may be necessary to run this recycling of change tracking with the virtual machine powered down. It may also be necessary to power cycle the virtual machine after disabling the change tracking and again after enabling it.