Year and a half educated us that WordPress security should not be dismissed by any means. Between 15% and 20% of the world's high traffic sites are powered by WordPress. The fact that it is an Open Source platform and everyone has access to its Source Code makes it a prey for hackers.
Install the fix hacked wordpress Firewall Plugin. Quit and this plugin investigates net requests to recognize attacks that are obvious.
Also, don't make the mistake of believing that your web host will have your back as far as WordPress copies go. Not always. It has been my experience that the company may or may not be doing backups, while they say that they do. Take that kind of chance?
It's a WordPress plugin. They are drop dead easy to set up, have all the features you need for a task like this, and are relatively cheap, especially when compared to having to employ someone to have this done for you.
You can also get an SSL Encyption Security for your WordPress blogs. The SSL Security makes encrypted and secure communications with your blog. You can even keep the all of the cookies and history of communication so that all helpful site transactions are recorded. Make sure that all your blogs get SSL security for utmost protection from hackers.
But realize that security is. Don't only be the type that is reactive, take action to begin today, protecting yourself. Do not let Joe the Hacker make your life miserable and turn everything in creating come crashing down in a matter of seconds that you've worked hard.