What are the prerequisites for using Changed Block Tracking (CBT) with VM backups in Veeam Kasten on OpenShift Virtualization 4.21? How can we validate that CBT is enabled and being used during backup operations?
If the CSI driver does not provide native CBT support, is there any workaround that combines the CSI driver with KubeVirt, libvirt, or QEMU modifications or configuration changes to enable incremental backups based on changed blocks?