# File lib/fog/aws/models/rds/snapshot.rb, line 41
        def save
          requires_one :instance_id, :cluster_id
          requires :id

          data = if instance_id
                   service.create_db_snapshot(instance_id, id).body['CreateDBSnapshotResult']['DBSnapshot']
                 elsif cluster_id
                   service.create_db_cluster_snapshot(cluster_id, id).body['CreateDBClusterSnapshotResult']['DBClusterSnapshot']
                 end
          merge_attributes(data)
          true
        end