Andi,
keep in mind that you can collect long time Historical data from one server from one broker, and at one moment if they move your account to another server, or if you open another live account it could be on another server.
Normally the broker should notify you about that, but I wouldn’t trust it.
Anyway, Thetrader is right, the more bars you have, the better, but your profit per day will reduce. Simply, the FSB Pro looks for such strategies that are working profitably over the whole period, which cause smaller daily profits.
Kind regards,