Support virtual resource group to protect a group of resources in a cluster system

A cluster system may include a group of single instances in it. For example, an Oracle RAC system includes many Oracle instances in it. When we want to protect an Oracle RAC as a whole, we have to protect all the single Oracle instances in it. Many backup vendors support this senario by creating a virtual resource group, which helps to organize all the instances in the cluster. Maybe we could also support this concept in Karbor, which in turn can help user protect related-resources more efficiently.