Systems and methods for managing a backup process of a database are disclosed. More specifically, the present invention is comprised of a windback device within a lubricant sump formed from the coupling of an annular sump housing, an annular fluid seal assembly, and a bearing. For each tone, the effects of the other tones are removed from the FT of the peak of the tone using the parameter estimates of the other tones to generate modified FT data for the tone. The device is inserted into a patient to a sampling site, and with the slits co-oriented, is extended into the sampling site. A plurality of accessory attachment fittings are disposed around the support columns. The dialysis fluid cassette includes a rigid portion defining a pumping section for operation with the pump actuator and a heating section for operation with the fluid heater.