To go about doing this all you need to have is a Desktop PC and some PS3 games of your choice to make backups.Other things you need are blank dvds, a fast reliable dvd burner and some ps3 copying software and that can download and read ps3 games then burn them onto your dvd blanks. If you get that components discussed then you are well on your way to copy PS3 games.
So grab a game and place it into your dvd burner then open up your PS3 copying software that will make to copies. There are numerous software options available that will do this, many of them free. You can download free software that requires you to download dozens of software to do different parts of the process of burning ps3 games, I prefer using a all in one package that can do the job with one simple click on a button.
Alot of people go for the free option and download all the software to their computer but most are unreliable and outdated plus some come with trojans or spyware.Soon as you download the software, start it up so it can read the disc and download to necessary files onto your PCs HDD.Be patient as this process can take some time to complete.
Puting your blank disk into your PC and then let it burn your game to the disk.
To get this all in one PS3 backup software goto -> copy PS3 games.