WordPress cloning, as it applies to fix malware problems free, is the act of making an exact replica of your WordPress install. What's great is that you can do it. There are a number of reasons why you might want to do this. Here are only a few.
Everything you've worked for will go with this, should the server of your site go down. You will make no sales, get signups or no visitors to your site, until you have the site and in short, you're out of business.
While it's an odd term, it represents a necessary task: making a WordPress backup of your site to work on offline, or in case something should go amiss. We're not simply being obsessive-compulsive here: servers go down every day, despite their claims of 99.9% uptime, and if you've had this happen to you, you understand the fear YOURURL.com is it can cause.
You can create a firewall that blocks hackers from infiltrating your own blogs. From coming into your files, the firewall prevents the hacker. You must have updated version of Apache. Upgrade your PHP. It's important that your system is filled with upgrades.
Do your homework and some searching, but if you are pressed for time and need to get this done once and for all, try the WordPress security plugin that I use. It is a relief to know that my website (and business!) are secure.