Keep your Ht Access file in check to prevent hacking

Using a .htaccess file, you can set access limits to certain directories. You can tie those limits to a specific IP address, which means that only people from that location can access your information.
.Htaccess stuff gets pretty complex, but AskApache has the Ultimate Tutorial for all things .htaccess. This post from WPTavern also has some good tips. (see tip #5).