Hi, I am totally technically illiterate, so am in desperate need of help! I have a 5 year old(ish) iMac running OS X 10.5.8.... my iPod classic died this week so I bought a new one, but it seems I need the new version of iTunes, which I can't upload until I've upgraded to Snow Leopard. I have the Snow Leopard installation discs, but I'm scared to upgrade in case I lose everything in my iTunes and iPhoto libraries. I'm trying to back up my iPhoto library on Photobucket (but I have 10,100 photos so it's taking a while!) and I don't even know where to start with backing up my iTunes library, as we have 172GB of music (2,265 albums). I'd like to back up the whole iMac but Time Machine isn't working. In the past Time Machine used to work, and I backed up to an external hard drive. Unfortunately one day the external hard drive just stopped working and since then (over a year ago ) I haven't been able to back up at all. When I click on Time Machine it just gives me empty drives, and doesn't allow me to configure Time Machine at all. I'm happy to buy another external drive to set up a Time Capsule, but this will be my third external drive (the two previous having both gone mystifyingly wrong for no apparent reason) and if I pay £120 for another external drive I need to know that it's going to be money well spent...I have no idea what went wrong with the previous two hard drives. One day they worked, the next they didn't...as far as I know, I didn't do anything to 'break' them at all... So my questions are.... 1)if I upgrade to Snow Leopard is there a real risk that I'll lose everything in my iTunes Library? 2) Is there a way of configuring Time Machine without an external hard drive? 3) If I need an external hard drive, is there anything I need to be doing that will stop it getting corrupted and stopping working??? Thank you so much in advance for your help - I know I sound like a total Luddite, but I am hopeless with anything techy and don't even know where to start!!!