During recovery of a master system, a mismatch between data in the master system and that in a backup system is obviated quickly to shorten time consumed before resumption of operation of the master system. The housing assembly also includes a fan and operation of the fan causes streams of air to enter and exit from the inlet and outlet and air to be conveyed within the outer casing to which heat from the computer hardware can be transferred. The polymer extruding device may further include a die including one or more injectors configured to inject nano particles into the die to cause shear stress to be exerted to the composite material, thereby forming a layer of the nano particles on a surface of the composite material. The object of the invention is to provide an improved method of manufacturing a micromechanical motion sensor, and to provide a micromechanical motion sensor suitable, in particular, for use in small micromechanical motion sensor solutions.