Yes, Exactly.
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Just to elaborate.
Yes I have a back up that contains the missing posts. The threads are there, it is just posts that are missing.
I have been using google webmaster tools, crawl errors to find the missing posts. I have been getting the thread id from the url and pasting it into the post table search of the back up database which is imported into phpadmin.
I then export only the data and insert it into the post table of the original database. This method works but takes too long.
What I want to do if possible is insert all of the back up post table but only insert the missing or empty tables.
Thanks