When I perform a Norton 360 backup I obtain an error saying "Some files were not backed up." I checked the details of the backup set I see that files greater than 4GB did not backup (none over 8GB). The entire backup set (including the files that were not backed up) is about 259GB. I have a 2TB backup drive and and the drive properties shows plenty of space for the backup set. I have about 11GB of RAM available and use about 15% of the CPU most of the time. If anyone has any ideas on how to get Norton to backup these larger files , please let me know.