I had backedup a VM now the VM has encrypted hard disk. And I get this error.
Disk exclusion is not supported for encrypted virtual machines. For more information, refer https://aka.ms/ExcludeDiskFeature
There seems to be no way to edit the backup policy. Is the only possible way to delete all backup and start a backup for the same VM again
You are trying to backup the vm with an exclusion feature on the disk and as the feature is not supported for an encrypted disk you are not able to back up.
You can remove the exclusion feature for that disk and then backup.
Command:
az backup protection update-for-vm --vault-name {vaultname} --resource-group {resourcegroup} -c {vmname} -i {vmname} --backup-management-type AzureIaasVM --disk-list-setting resetexclusionsettings