A retainer device for attaching a heat sink to a CPU includes a retention module, a clamp, and a crank. A backup module storing data within a collection of containers according to access locality and retention time of the data, wherein the retention time defines an amount of time the data is stored within the collection of containers before deletion of the data, and the access locality comprises an order in which the data is to be accessed is further provided. On a surface of the silicon layer, which is the surface on the side of the supporting substrate, the second insulating layer is provided. The phase of the shifted spectral line at the chip frequency is determined as a function of sampling time points. The advantage is a high quality building constructed at reasonable cost. The output signalling controls the operations of the processing stage.