Checking for Broken Links and Unused Images
As your site ages, links around the web will break, some will disappear – leaving your readers in the lurch and possible lowering your search engine rankings. The Broken Link Checker plugin can help you identify and resolve these issues.
Also, as you edit posts, you’ll leave media files on the site that you don’t need anymore. This will slow down your backups. The Delete Unused Images plugin may assist with this.