ISO emulators allow you to play ISOs or your backup files directly from your PC or laptop through a USB connection which connects to your wii they are very simple to install you get all the cables and adapters neccesary to complete the installation and the software to run the emulators is free and ideal solution for those wanting to store their backups on a hard drive instead of burning DVDs.  Please note that these chips only emulate from a hard disk drive if you want to boot from a backup DVD you will need to additionally install a mod chip ISO PC to Wii Emulators