A good rule of thumb is to always bring an external hard drive or flash drive as a back-up for all your studio recordings. You've invested your heart, soul, time, and money into the recording, so be sure to make an extra copy (or two) of your session files. Things happen and you don't want to loose all your hard work only to wind up starting over from the beginning. Now that storage media is so affordable, there is really no reason you shouldn't back up all your work. There are lots of great websites to get a good price on storage media. Check http://www.macmall.com or http://www.amazon.com for great deals. If you need any advice on purchasing storage media, just contact the studio.