If you have issues with your backups because of a Changed Block Tracking Issue, it could because you created the backup job with a ESXi user that does not have permissions to enable the “ctkEnabled” (Changed Block Tracking) to true. Either assign the proper permissions and rerun the job, or use vCenter or ViClient to modify the flag manually. The VM must be off. Then Edit the VM’s settings, click on the options tab, then on “General” in the list, then click on “Configuration” then scroll down the Configuration Parameters until you see “ctkEnabled” type “true” for every instance you see. Either solution should fix your issues.