By default, WordPress generates three sizes of each image that you upload. Themes and plugins can generate additional image sizes which can easily push the number between 5 – 10. If you have a lot of image based content on your site, then after a while this may increase your storage needs and backup file size. In this article, we will show you how to prevent WordPress from generating image sizes.
http://www.wpbeginner.com/wp-tutorials/how-to-prevent-wordpress-from-generating-image-sizes/
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