I've upgraded to Kasten v6.5. I was able to back up RedHat OpenShift Virtualization VM using Snapshot and S3. However was not able to restore from S3 using TransformSet which I have created on v6.0.12. You may refer to https://www.ms4u.info/2023/12/unable-to-restore-ocp-v-vm-from-s3-when.html .
Reported as a bug for a future fix.
The workaround is to create a transform when doing restoration. [Click on below to view in large mode]