Hello, need some advice on getting Snow Leopard. I currently have a 2006 Macbook white, and its served me very well over the years. But it is starting to show its age and I can't afford a new machine just yet - so for now I want to upgrade it with more memory etc. The macbook came with Tiger, and in 2008 my friend installed his Leopard onto it for me. However I have no Tiger/Leopard installation discs whatsoever. I want to time machine back up my Mac on an external, format the Mac, add new memory and then buy and install Snow Leopard. I have 2 questions: Can I install Snow Leopard without any other original installation discs? When I time machine all my stuff back onto the Mac will all my applications need installing again (i.e Photoshop) ? Any advice would be helpful!