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Your feedback is best submitted in the Ideas section.
With that being said, you should probably submit an idea with more detail around how they can be more transparent. If you right click your source and select Extract > History, you will be able to see the date/time of the last extract and the total number of rows. Wouldn't this solve the problem?
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My bad, Tom, wasn't sure where to submit a feature request (though I did search for guidance).
One of the tricky things is that a refreshed extract will not update the 'date modified' field in a Windows directory. Since my post -- as you mentioned in your reply -- I learned to look at the Extract History to see the time and date of the most recent refresh.
In a nutshell, a simple Save/Save As feature for creating extracts would be ideal.