When considering to make a backup of a DVD its better to make an ISO image file rather than just copying the DVD,which keeps your data much more secure,from virus infection and data corruption.
Follow these steps to make an ISO image files from your DVD/CD.
Step 1:Download Power ISO/Ultra ISO.
Download Power ISO 32-bit
Download Power ISO 64-bit
Download UltraISO.
Step 2:Install the setup file,complete the installation.
Step 3:Insert your DVD/CD.
Step 4:
Right click on the DVD RW Drive icon in Computer and select Ultra ISO/Power ISO.And select create CD/DVD image for Ultra ISO and Create image file for Power ISO.
Step 5:Select location and SAVE !
Look for your ISO file in your Documents(by default).
DONE !!!!!!!