Bill Davidson survived one nightmare every IT manager dreads. He arrived to work on a Friday morning as fire devoured his company’s building. No one was injured, but fire and smoke damage ruined almost everything at MARS Advertising. Davidson, the CIO, had to replace all the servers and end-user PCs and reinstall the network quickly – or the 300-person firm specializing in brand marketing for consumer packaged goods companies would fall behind. After a work-around-the-clock weekend, Davidson had most of the company’s new systems and e-mail up and running by Monday morning in a new building close to the firm’s old Southfield, Michigan headquarters. The keys to his success? Great network documentation and data backups proved essential, he says.