A man who goes to great lengths to avoid risk, embarassment, or exposure. i.e., if the belt should break, the suspenders will keep his pants on. Not quite paranoid, but on his way there. Can also be said of a man with something to hide. (or less than something as the case may be)
Lars, a real belt-and-suspenders man, saves every single email he sends and receives and archives them to CD, claiming "you just can't be too careful".