I have Time Machine and it keeps telling me that i do'nt have enough space to back up whats on my computer. I haven't put anything particularly big on there recently so I'm confused. But maybe I need to just get rid of stuff on my hard drive. But what can I delete? I don't understand what half these applications and folders are for. Or do you think there's another problem? I have a 2006 iMac with Safari OS x 10.6.8