The last i heard MFP were not allowed to store historical data for the sports exchange. With no previous data, you can only forward test.
Not quite correct 1oser, Welldone have beta tested a Time Machine for MFPro that uses historical timed data. The beta test is currently suspended, as Betfair required various encryption of the data, I believe. Properly licensed software developers can apparently sell historical data, just as Fracsoft have done.