Are you on a mac or a pc?
For Mac, open a finder window (click on the hard drive icon or on any folder), find the "Music" folder on the left and click on it.
Open the "iTunes" folder
Open the "iTunes Music" folder
Select all of the folders you want backed up inside that folder. Drag those onto the hard drive icon either on your desktop or inside that finder window.
Perhaps some other helpful person can provide PC instructions?
For Mac, open a finder window (click on the hard drive icon or on any folder), find the "Music" folder on the left and click on it.
Open the "iTunes" folder
Open the "iTunes Music" folder
Select all of the folders you want backed up inside that folder. Drag those onto the hard drive icon either on your desktop or inside that finder window.
Perhaps some other helpful person can provide PC instructions?