The disclosure relates to a thermostatic mixer, including a device for the dynamic regulation of the cold water flow which supplies the mixer. The fluid treatment pack includes a fluid treatment medium, a feed region, and a permeate region. The method includes initiating a backup operation of data including a plurality of items, interrupting the backup operation, where interrupting occurs after a portion of the data has been completed, receiving an input to resume the backup operation, identifying a previously completed portion of the backup data, and performing a backup of a remaining uncompleted portion of the backup data. Further because the expansion portion is located at the outward rim of the base portion, it is easier for the expansion portion to extend to all directions when pressed. As a result, the strength of the entire article transverse pushing body can be increased without increasing the weight of equipment and, for example, when a heavy article is conveyed, it can be pushed transversely and transferred sidewise without deforming the article transverse pushing body.