Hi,
You can do both fine. To store the PDF on a location on the web server, you will need to:
1. Handle the ASPXToPDF controls' AfterRender event. Inside that event you can get the PdfDocument object, you can then use that object to save the PDF file to disk. See here for sample code:
http://www.essentialobjects.com/doc/1/eo.web.aspxtopdf.afterrender.aspx2. Optionally, you will need to call RenderAsPDF(false) to prevent the same PDF file being sent to client side. Note the additional "false" argument passed to RenderAsPDF;
Hope this helps. Please feel free to let us know if you have any more questions.
Thanks!