Yes, PDFCreator has an autosave function. You can change the configuration for this feature using Change Profile Settings from the application. If there isn’t a profile, click the plus sign and create one. Additionally, choose the folder where the files will be autosaved and tweak various features offered through the same window.
A complete guide can be found on the developer’s page using the following URL: http://www.pdfforge.org/pdfcreator/manual/autosave-mode