Message logs in the Management Console of the Cloud Failover Appliance show the following error:
VMwareBackupJobRunner: error encountered during VM backup: com.rvx.vmware.exceptions.VmwareBackupException: com.rvx.vmware.exceptions.RunnerStatusFailedException: com.rvx.nativ.vmware.vixexceptions.VixEDISKOUTOFRANGE: You have requested access to an area of the virtual disk that is out of bounds
This error is generated when the Changed Block Tracking (CBT) is attempting to gather data from a VMDK, and VMware believes the data is outside the range of the VMDK. This error shows up when the VMDK size is increased.
Steps to resolve
Reset CBT on the VM to allow backups to run correctly.