copying DVDs

If this is a homemade dvd with no copy protection, you already have all you need in Disk Utility.

Insert the original dvd, open Disk Utility, select the disk and create an image (.dmg), then use Disk Utility to burn the image to a blank disk.

 

what if you want to backup a dvd bought from the store

 

I could go into how, but I'm feeling crumudgenly. Do a forum search on the topic, there are a number of threads that already explain how.