I work for our regional police service and I can say from experience that laptops are stolen every day. They are stolen from homes when the owners are sleeping, they are stolen from homes when the owners are away. They are stolen from cars when the owners are "just in the coffee shop for a minute", they are stolen from cars when they're left in the driveway overnight. They are left in taxis and on busses and they never come back.
Or, sometimes their hard drives crash, or somebody trips over the power cable and they get yanked off the table, or somebody trips in the parking lot and they get dropped into a puddle. (A buddy of mine just lost every photo of his son he ever had due to a hard drive crash -- his kid is now 5 years old -- over a thousand photos, gone.)
The moral of this story is: Backup storage is about the cheapest insurance you can buy. I can buy an 8GB USB memory stick for $14 that will hold thousands of photos safely in my pocket, or office desk, or safety deposit box, forever. (That's less than half-a-cent per photo...) For $100 I can get a 1TB external HD that will store six times the contents of my entire laptop. (That's three-one-hundredth of a cent per photo...)
In 2011 if you don't have your laptop backed-up (or at least the irreplaceable / hard to replace stuff on it) I don't feel the least bit sorry for you.