I copied the news article from different sources for more than 2 years and now I'm copying the content & specifying the canonical URL of source websites(hope this is the correct way to do it [correct me if I'm wrong]). but my question is what should I do to the previous posts, I have no idea on where I copied those articles and obviously it have more than 2000 pages, So I'm unable to do canonical tag for the previous posts, how should I fix this ? (or) will I leave those articles as it is ? please suggest me a solution!
Please don't mark duplicate with What is duplicate content and how can I avoid being penalized for it on my site? I already read that post, here my situation is different.