Maybe I’m biased here because I just got a panic call from someone who’s lost a whole load of critical information, but…surely the most important security tool is not anti-virus software, or firewalls, or anti-spyware. It’s got to be backups.
There are any number of threats out there, and any number of technologies available to protect you from them, but at the end of the day, the warm cozy feeling of knowing that no matter what happens, all your critical data is nicely secured offsite is priceless.
That’s not to say you don’t need all the other stuff. Anyone who doesn’t have proper virus protection and a decent firewall in place nowadays is just crazy. But even with all these measures in place, bad stuff can still happen. Properly implemented and properly executed backups are the magic wand that will save the day and leave you looking like a hero. (The downside is that poorly implemented backups, that have missed out on some key information, or that haven’t been checked, could cost you your job, so make sure you get it right.)