Reply to Backing up Itunes playlists.. How to?

Hey guys I just got a new internal hard drive (on a mac) and I was wanting to go ahead and switch it out. Here is my dilemma I have 4 events coming up and have a very organized playlist system going on in Itunes. I have seen how you can back up individual playlists one at a time but that would take me quite some time to do. Is there an easier way to copy all my playlists and have them reappear when I use the new hard drive?