I have a few questions about Lion and making backups and all. So I hear two different things, boot disc and install disc. I assume boot disc is like some kind of recovery software. Like not the whole OS but includes some applications like Disk Utility to fix some hardware problem. There install disc would be like an install disc to upgrade other people to Lion? What I am asking here is the difference because I am confused. I am looking to make something where I can install Lion just in case something goes wrong with my computer. For this do I need both discs or just the install? In addition I have seen ways to make both DVD Lion discs and USB Lion discs. Which is the better to use?