Files can easily get lost if you do not have good protection on your website. Some of those files may be saved in your computer and easily replaceable, but what about the rest of them? If you lose the first time to them where are you going to get them out of again? Especially secure your wordpress website is vital. Long-term sites have a lot of data and have created a number of documents. Recreating that all are a nightmare, and not something any business from this source owner would like to do.
Is also important. You need to backup all the database and files so in case of a sudden attack, you can easily bring back your blog like nothing.
Move your wp-config.php file one directory up from the WordPress root. WordPress will look for it if it cannot be found in the main directory. Additionally, nobody will be able to read the file unless they've FTP or SSH access.
Upgrade, if you aren't running the latest version view website of WordPress. Leaving your website on an old version is like keeping your door unlocked when you leave for vacation.
Software: If you've installed free scripts like Wordpress, search Google for'wordpress security'. You will get many tips.