KB ID: 23
Issue:
"Failed to perform pre-backup steps :: CBT not enabled. Backup cannot continue." This problem is commonly encountered in VMware ESXi 5.5.x machines due to a known issue with enabling Changed Block Tracking (CBT), as explained in the VMware KB article.
Cause:
The issue arises from a known problem in enabling CBT on VMware ESXi 5.5.x machines.
Solution:
To resolve this issue, follow the instructions provided in the VMware KB article mentioned above. Reset the CBT value by editing the VMX file of the guest VM that is the subject of the backup. After resetting the CBT, initiate the backup job and observe the results.
**Note:** Ensure that you have the necessary permissions and make a backup of critical data before making any changes.