I have a computer running Windows 8 with 1TB hard drive. Just recently I received a disk full message. Windows Explorer could not find the large files causing this. With some research it is the Norton 360 Backup using about 750GB of storage. I am wondering, since it is backing up on C drive, whether it is creating a backup of the backup. I realize it should not be on C drive but that is the only drive available and so by default it must be using it. Actually we did not set it up it must by default backup on the first drive available. If anyone has any thoughts on how to stop this or have had this same experience please let me know.