Mac users-How worried are you for your hard drives?

Seeing as how Apple Products have been some of the fasted selling and most powerful computers/products on the market lately, I'm increasingly afraid of hackers finally turning against Macs! For the longest time PC's have been the biggest threat but really, I'm thinking Macs are becoming much more powerful. Dreamworks and other animated movie companies mainly use Mac and I'm just sure hackers are soon going to realize this and are going to attack. It won't be long before businesses are going to realize their power, too, and be making the switch, ultimately putting a huge target on Macintosh. So my question is, How worried are you for your precious computers and should we be more nervous? How can we prevent our idolized computers from these types of horrors?