Thanks. I'm going to mess around with this tomorrow.
One question - Can I just back up my Apps folder? Or do I need to back up anything?
I don't really have any new files on my computer, just some new Apps. I purchased Office from Online so I just want to make sure it works when I do the clean install.
I did a full backup through TimeMachine to an external hard drive just in case something went wrong, just because I'm OCD like that. Plus I am a student and have a lot of important files on my mac. Then used a USB as the boot drive, like the article explains.
p.s. I didn't restore from a backup though. I manually added the files I needed back onto my mac because I had 90+ GB of "other" taking up space. By not restoring from a backup, you prevent yourself from putting unneeded "junk"/old files right back onto your drive. Just cleans things up a bit.
Not a necessary step, but it made a huge difference for me.