Registry checkpointing provides consistency between the registry settings for both nodes. For example, if a registry change is made to a service on the active node, that change is replicated to the inactive node. When registry modifications are made to a resource service that is offline, the cluster server will not be aware of the modifications. Therefore, changes made to a cluster service when offline are rolled back when the service is brought back online. The key point to remember is that registry modifications relating to a service that is not started are lost when the service is brought back online.