Right NOW you have a legal right under existing U.S. Federal law to make one copy of any disk that you purchase! No licensing agreement is allowed to circumvent this provision - although they would like to imply that you only "licensed" the item. The law is clear. If you paid for a license and a disk, you ARE allowed to make ONE copy of the disk for backup purposes. Obviously, any new legislation promoted by the Industry will negate that provision, should it pass.
A note on that subject. It has to be an exact copy, and backup circumventing copy protection does not qualify.