Hi southsidevacuum
The Export PRO can export the data you have in your database, What it cannot do is calculations.
For example, you can export orders from a specific date or range but you cannot export the stock that a product had 2 months ago (mainly because that is not what you actually have in the db).
What you can also do is run scheduled exports and save the files in your server or send them to an email. So you can compare them later in Excel, for example.
Best Regards,
Salva.