So lately my mac book pro has been running a little slow and with summer approaching (no school) i would like to reformat my mac then. I will aslo be adding additional ram when reformatting. So how would I go about doing this? I have an external hard drive for a mac. So do I just backup everything I want? Is there a "best" way to backup all the files on my computer? What do I do after I've backed up everything? Any help is greatly appreciated.