The present disclosure includes apparatuses and methods related to a data buffer in a non-volatile dual in-line memory module (NVDIMM). An example apparatus can include a data buffer couplable to a host, a first memory device (e.g., volatile memory), wherein the first memory device is coupled to the data buffer via a first bus, a second memory device (e.g., non-volatile memory), and a controller, wherein the controller is coupled to the data buffer via a second bus and wherein the controller is configured to cause a data transfer from first memory device to the second memory device via the data buffer and the second bus.