WordPress cloning, as it applies to fix hacked wordpress, is the act of making an exact copy of your WordPress install. What is good is that in just a couple clicks, you can do it with the right software. There are a lot of reasons why you might want to do this. Here are only a few.
An easy way to keep WordPress safe would linked here be to use a few tools. To begin with, don't allow people run a web host security scan to list the files in your folders and automatically backup your web hosting account.
Exploit Scanner goes through the files on your site comment database and place tables. You are also notified by it for odd plugin names. It does not remove anything, it simply warns you.
Imagine if you visit WP-Content/plugins, can you see that folder? If so, upload that blank Index.html file into that folder as well so people can't view what click for source plugins you have. Because even if your current version of WordPress is up to date, if you're using a plugin or an old plugin using a security hole, then someone can use this to get access.
Don't use wp_. Most web hosting providers are eliminating that default but if yours doesn't, fix wp_ to anything else but that.