Really you should perform backups on a regular basis. But the fall is a good time to get started. I picked up one of these NewerTech Voyager drive dock to make it much easier to slap in a sata drive and backup the large files I tend to neglect in my regular backups. Things like audio and video project files. These unit come in a variety of configurations. I picked up the quad interface because I use firewire 800 with my large external RAID drive where I keep my big files like my iTunes library, final cut and audio files. But you can even get one in a new USB 3.0 configuration.
Just remember to use something like a Brother Ptouch labeler to label your drives with what you have backed up on them.