Backup your data

A co-worker shared this story on the importance of backing up your data:
A criminal group showed up on Thanksgiving weekend and cleaned us out. They backed up a truck to our loading dock, disabled our alarm systems then went through the office and took all the laptop and desktop machines. Fortunately for us, the unix servers were left alone. Even though these guys had defeated our internal lock systems and could have taken them, they must have considered them too difficult to fence. Our release was delayed by quite a bit because the PC developers had all the best desktop machines (which had all been stolen) and all their source code was on their machines. So they basically had to go back and re-do that last month's worth of work.