I have many PDF files throughout my documents folders. There is one directory where 12 of 53 pdf files are not backed up and I get no error from Norton. These were all downloaded from my insurance company I get around it by "including" all of the files in that folder. This works but what about new docs downloaded? I will say that all of the affected pdfs were consecutive in a date range...Feb - Mar 2013...everything before and after gets backed up no problems. The files properties all match whether backed up or not. This was happening with Norton 360 as well.