I have Norton 360, but I use True Image as my backup utility. Looking at the help in Norton 360 I copied this data that might answer your question. Hope it helps, :-)
When Norton 360 prepares to perform a backup, it must examine your PC for files that need to be backed up, either because they have changed since the last backup, or because they have never been backed up before.
You can choose how extensive this examination is by choosing between the following two backup plans that are provided by Norton 360:
Quick Backup (recommended)
A Quick Backup examines your Desktop, you're my Documents folder, and other key file locations that belong to your Windows account. You can choose both individual files and categories of files to be included in your backup. Choose this backup plan if you keep your important files in the folders that belong to your Windows account.
A Full Backup examines your entire PC for files to back up, regardless of the Windows account to which they belong. You can choose both individual files and categories of files to be included in your backup. Choose this backup plan if you store some of your important files outside of the folders assigned to your Windows account, or if your PC has several Windows accounts that you want to back up.