Network security is there to combat viruses and hackers, but it seems that the reason people write viruses or hack into networks is actually because we live in a society where everything is overly restricted. Have you ever heard of the notion that expectations will dictate reality? Simply by expecting foul play and preparing for it ultimately gives people the drive for foul play in the first place.
Imagine though having an office computer that would back up files in 3 different ways: cloud, the computer's own hard drive, and a flash drive. Then, if for whatever reason software or files become corrupt, just do a fresh install of the operating system and reinstall the software quick -- with processors and RAM as fast as they are these days, it'd take literally a few minutes. Then, have the server automatically set all of the computer's network settings back to what they need to be.

There's really no reason for keeping everything as tight as a nun's asshole.