Missing workflow metadata from SharePoint document library

I have a basic document library using the basic "approval" workflow out of the box in SharePoint. It seems some of the metadata from the workflows stating that the document has been approved seems to be missing. As far as I know, nothing is being deleted. I included a screen shot and hopefully that help explain what I'm talking about. Hopefully I can post some more information tomorrow once I gather some more details.
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Not entirelly sure if this is the issue you're seeing, however, here is an information that may explain why some metadata is missing: by default settings, older than 30 days completed workflows are purged for performance reasons. The history of these workflows is kept in the History List that was setup when workflow was created.

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DxtrLwsAuthor Commented:
I had no clue that it got purged from the system after a while. I believe that's what is happening here. Looks like the "History List" also gets purged as well. Is there way to permanently keep the workflow metatdata, either in the current document library or in another custom list?
Actually, I do not believe the History list is purged; at least I was able to find there all the items since months ago. It is however a bit complicated to relate the item to the history (as they are linked on item ID and list ID) and sometimes to find the list. If you use the default settings, the list is hidden - not showing on the browser - need to navigate directly to it: http://URL_TO_YOUR_SITE/Lists/workflow%20history/AllItems.aspx

Here is a link to a blog where you may find some ideas on how to stop the timer job or to view the history in a user-friendly way:
In this blog they say the interval is 60 days, so I may have been wrong on that. Sorry.

Hope this helps
DxtrLwsAuthor Commented:
Thanks for you help and quick response. This was very helpful!
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