Whole system persistence (WSP) is a concept for retaining the computational state of a system even in case of a power failure. In the context of server systems, WSP could render it possible to quickly power on and off machines that only need to be used occasionally, thus saving energy. This paper takes on this idea and discusses multiple approaches for implementing WSP on such machines. Our evaluation shows that after starting a system, an NVM-based version of WSP can achieve tail latency improvements of up to 93% compared to booting a system and loading data from an SSD. At the same time, WSP is able to provide suspend and resume times in the order of tens of milliseconds.