You can create a report that shows information about the historical settings.
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 Expand the Version Control Root node and the required container.  | 
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 Right-click the required controlled object and select Show History.   | 
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 Click Close.  | 
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 Click Close.  | 
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 Use the default RSoP comparison source, use the ellipse button to select an existing source, or click New RSoP to create a new source.  | 
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 Select Show differences only if you want the generated reports to only display differences; otherwise differences and similarities are displayed.  | 
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 Click New RSoP to create a new source or use the ellipse button to select an existing source.  | 
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 Select Show differences only if you want the generated reports to only display differences; otherwise differences and similarities are displayed.  | 
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 Select one or more GPOs, right-click and select Export Policy RegistrySettings to CSV.   |