I backup my files using windows backup to an external hard disk. But the backup size is smaller than the selected files. The files that are selected to be backed up are 30-40 GB, and the size of the backup shows it is only 3.7 GB. Why is this. It says its 3.7 both in the control panel for windows backup, and when looking at properties on the backup folder. Is it being backed up correctly?? Thanks for the help!