Yes. If you periodically save your PDWare file to an accessible location (either a network server or a local disc), you can run the PDWare Comparison Report to examine and compare data from any two periods. For example, if you are on a monthly update cycle (as almost everyone should be), you would Get Data for all the data of interest and do a PDWare File > Save As with a file name such as “2014_09_30 Data.pdw”. Repeat that every period (being sure to get the same date range and project and resource nodes each time).
At any point in time, launch the Comparison report from PDWare and select one saved file as your Base and another as your Compare file.