Hi, I'm thinking of upgrading my Imac from Leopard 10.5.8 to Snow Leopard then to Mavericks, if possible, so I would need to back up my files. I was wondering if someone could recommend a good external storage device/hard drive that will work with both Leopard and newer systems and isn't too expensive (under 100$, ideally). 500gb of storage capacity would be plenty, but if it's just a few dollars more for twice that, it may be worth it. Also, if it's a more expensive one, but currently on sale, that would be good. I haven't used external storage before, so I'm not sure what to look for when shopping around. I hear some drives are "faster" than others, does that just mean for data transfer? I would probably transfer all files once before installing the new system, then still use it afterwards as backup. I have a desktop, Imac 8,1 with 2.4 Ghz Intel Core 2 Duo, 1gb RAM (but I plan to add at least 2 more GB to that). So the device doesn't need to be ultra slim or anything. Just reliable and not too expensive. Any suggestions? Thanks!