The Berkman Center for Internet & Society has released Amber.
Here's an excerpt from the announcement:
The Berkman Center for Internet & Society at Harvard University is pleased to release Amber, a free software tool for WordPress and Drupal that preserves content and prevents broken links. When installed on a blog or website, Amber can take a snapshot of the content of every linked page, ensuring that even if those pages are interfered with or blocked, the original content will be available.
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