To prevent search engines from indexing identical content across your sites and punishing you for “duplicate content”, you can set the canonical tag on your sub-sites to the URL of the content on your source site. Content Sync provides a token [cms_content_sync:source_url] to handle this automatically for you. As this token uses the local content URL as a fallback for content that wasn't pulled from another site, you can use this token instead of the default node URL token for all your content: