Hi everyone, I PM'd Tom about this but I'd like to hear from other Mac users. I'm going to be helping out a family member with a Mac that's running really slow. What sort of things should I be looking for? I don't know the ins and outs of OSX well enough to know what to look for to speed the system up.

They're also having Time Machine backup problems (in that it stopped backing up), but I don't really know what's going on there so I won't ask for help with that one yet

Thanks for any advice, I'm still trying to learn Macs.