How come a piece of software that costs thousands of dollars doesn’t have the basic function of being able to automatically save your work after so many frames?
Come on Toon Boom, help us out here!
Take a look at this thread:
http://www.toonboom.com/support/forums/animate/index.php?board=18;action=display;threadid=2955
This has been added as a Feature Request in that section of the forums, so feel free to add your voice to that thread. 
~Lilly