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.