Re-using unique content from my sites that no longer exist

I'm wondering if it's useful from a SEO perspective to use unique content from sites that no longer exist. This means my own sites that were once on the web but have ceased to exist. I have saved the articles/blog posts that I used for these sites, and since the content is no longer indexed on Google (as the sites are dead), presumably it won't be treated as duplicate content. There would be at least two options for using this content:

1. Using it for link building purposes.
2. Using...

Re-using unique content from my sites that no longer exist

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