The Data Practices Act states that all data are accessible "unless classified by statute, or temporary classification pursuant to § 13.06, or federal law, as nonpublic or protected nonpublic, or with respect to data on individuals, as private or confidential." § 13.03, subd. 1.
Thus, there are no general exemptions from the Act. There are a large number of categories of data rendered non-public by specific provisions of the Act itself.