Small, external hard-drives have plummeted in price in recent years. I remember the first external drive I took out on the road with me in 2003 it weighed about 3 pounds and featured a full-sized IDE hard drive in an enclosure. Now, I carry three times the storage in a palm-sized box that weighs virtually nothing, and, most importantly, cost very little. Keeping an external hard drive ONLY for backing up your session files is a great idea, and a great investment to keeping your studio running smoothly.
Good Backup Practices
Doing nightly backups of your session material will save you from the embarrassing situation of having to re-record material you've already spent hours on, not to mention the mixing work that you lost. It also helps when visiting other studios to do work; you won't have to take the time to burn CDs of data. A small investment to making sure your daily studio work goes uninterrupted!

