You can compare your site stored locally on your disk to your web site, i.e. can verify if all the files are successfully uploaded or changed by a hacker.
If you have links to other sites you can check broken links and version changes. For example, on release date, WebESC could check RapidShare links if broken.
WebESC in local mode helps you to track the file changes on your computer. You can compare your local files for any change, e.g. by a virus.