luvsicpart6

So there was a youtube video which explained that you only need 3 files apparently, some XML, an exe and one other however I don't understand how this is all you need in order to make a backup. What about emulators, roms, and boxart/music? Can someone explain to me start to finish how to make a backup of all my launchbox files so that I can create multiple backups on my portable hard drives? Thank you.