I have a Power Mac G5 (dual 1.8) with a 160GB hard drive (114GB is still available). I went out and bought a Western Digital My Book external hard drive as they were on sale at Best Buy (320GB for $169). Now I am questioning if I should have even purchased this external hard drive or not since I still have 114GB left on my computer hard drive and I only use my computer for home office use. I could just back up my photos and music on a DVD instead. What does everyone think? How important is it to have an external hard drive if I still have 114GB left on my current one? Also, is the Western Digital My Book the best external hard drive made for a Mac? Quality and reputation is very important to me.