Pro Tools does not have the capacity to burn CD-R's built into its software. You must use a CD burning application to burn the data CD. (ie. EZ CD Creator or Nero for Windows. iTunes, Toast, or Jam for Mac).The main issue with backing up the Pro Tools session onto a CD is the size of the Pro Tools session folder. A CD-R can only hold either 650 or 700 mb of data. (The size will be printed on the CD itself). If the Pro Tools session is small enough to fit on a CD, launch the CD burning software and drag the Pro Tools session folder into the application window and burn a data CD. How do I back up my Pro Tools session onto a CD-R, if my session is too large for a CD-R to hold?When you create a Pro Tools session, it creates a Session folder. Within the Session folder is a Pro Tools Session file (looks like a tape real icon), the Audio Files folder, and possibly a Fade Files folder. The audio files within the Audio Files folder is what takes up a lot of space. Most Pro Tools sessions can easily take up over 1 gigabyte of disk space. Consequently, more than one CD must be used to back up your Pro Tools session. How do I divide up my Pro Tools session to fit on multiple CD-R's:1) Create another folder on the computer's desktop. Name the folder "Audio Files for (the name of the song)".2) Go to the Pro Tools session folder and open it. Double-click on the Audio Files folder. Drag over half of the audio files into the new folder you created on the computer's desktop. Now, the audio files have been split up into two folders.3) Launch the CD burning software. Drag the Pro Tools session folder onto the CD burning software application window and burn a data CD. This CD should contain the Pro Tools Session folder, the Pro Tools Session file (tape real icon), Audio files folder (with half the audio files), and possibly the Fade Files folder. 4) After finishing burning the first data CD, begin the process again, but this time just burn a CD that only contains the folder created on the computer's desktop. Thus, burn a CD-R of "Audio Files for (the name of the song)". If necessary, split up the audio files three ways, if the session is too large to fit on two CD-R's, etc. Now, there will be two or more CD-R's that contain all the files necessary to completely back-up the Pro Tools session. 5) If you want to restore the Pro Tools session back onto the computer, you will have to copy all files from the CD-R's back to the hard drive, then reunite all the audio files back into the original Audio Files folder within the Pro Tools session folder.