Cloning, as it applies to fix hacked wordpress database, is the act of creating an exact copy of your WordPress install. What is good is that with the right software, you can do it. There are a number of reasons why you may want to do this. Here are only a few.
Essentially, it will all start with the fundamentals. Attempt using complex passwords. Use numbers, letters, special characters, and spaces and combine them to create a password that is unique. You can use usernames that aren't obvious.
This is quite handy plugin, protecting you against brute-force password-crack strikes. It keeps track of the IP address of every failed login attempt. You can configure the plugin to disable login attempts for a selection of IP addresses when a certain number of failed attempts is reached.
If you're not running the latest version of WordPress, upgrade. Like maintaining your door unlocked when you leave for vacation leaving your website is.
There is another problem you have with WordPress. People know where they can login and additionally they could drop by with your login form and try outside a different combination of passwords and user accounts. In order to prevent this from happening you want to install Login Lockdown. It's a plugin that lets users attempt to login with a password three Get More Information times. After that the IP address will be banned from the server for a certain amount of time.