Template Part missing or deleted

I am having a problem with my template. It is giving me an error message: Template part has been deleted or is unavailable: header-large-with-banner and Template part has been deleted or is unavailable: footer. They disappeared and I cannot get them back to the formatted version that I have on my site. How can I get those to display again? I have reverted to a backup version a couple of weeks ago. That didn’t fix it.

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