Both models of the Xbox 360, fat and slim, can be modified to play backup games. Backup games protect your gaming investment by allowing you to make a copy of the disc you own, so you can protect the original one from damage. This is especially good for families with children, as they are prone to damaging discs. You will still be able to play on Xbox live, and the system will function exactly the same as before, except now it can play backup games. And of course, you can still use your original discs.

All versions of the Nintendo Wii can be modified to play backup games. All that is needed is an inexpensive SD card and a flash drive. Backup games protect your gaming investment by protecting the original disc from damage. The backup game loads off of the flash drive, protecting the original disc and dramatically increasing loading performance. Of course, you can still play your original discs. In addition, you can play classic games from classic systems like the NES, SNES, and Genesis on your Wii. 

All versions of the Playstation 3 under firmware 3.55 can be modified. If you have firmware 3.56 or above, your system cannot be modified at this time. Modification of the system will allow you to play backup copies of your games, protecting your original disc. These backups can be saved to the hard drive, negating the need to carry around the fragile discs. In addition, you can play classic games from systems such as the NES, SNES, Genesis, and more.  Of course, you can still play your original games and the system functions as normal.