Google Sites
Google Sites is a structured WYSIWYG wiki / web site creation tool.
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Tools
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Sites Backup
Backupify - Backup your sites with several data plans which users need to pay for the service
HTTrack Website copier - It allows you to download a World Wide Web site from the Internet to a local directory, building recursively all directories, getting HTML, images, and other files from the server to your computer. HTTrack arranges the original site's relative link-structure. Simply open a page of the "mirrored" website in your browser, and you can browse the site from link to link, as if you were viewing it online. HTTrack can also update an existing mirrored site, and resume interrupted downloads. HTTrack is fully configurable, and has an integrated help system.