I bought my first external hard drive the other day in order to back up things that are on my macbook pro, such as songs and pictures, and then to be able to use the hard drive for time machine, but i had a question, can i just draw over the iTunes folder for example and will it keep all of my purchased songs? what about my iPhoto library? And once i do a fresh install, can i just drag the files over again and iTunes and iPhoto will recognize them? thanks for the advice!