Justifying the existence of IT

bakamaki writes: I work for a small manufacturing company as a SysAdmin. My boss is a DBA. We are the only IT employees. He recently decided to record hours spent on his projects and then evaluate how much time the databases he writes save the employees. Then he translates that into a $ figure. He's asking me to do something similar but I'm kinda at a loss. It seems most of the stuff I do is preventative, IE care and feeding of servers and network infrastructure in addition to all the break fix stuff I do for the user base with their desktops. When in this position what do you folks usually do (other than quit and turn off your cellphone when they start calling because everything has gone to crap).