Yes. First, click the Preferences button in the upper right corner of the SpiderOak application window, then select the 'Back Up' tab. If you don't want to backup files older than a certain date, check this box and enter a number of days. SpiderOak will not backup any files which were created more than the specified number of days ago. Please note this preference only works for files that are not yet a part of your backup set. This preference will never purge files which you have already backed up, including historical versions.