It says here on the FAQ :

Is it possible to see history of flights on Flightradar24.com?

Yes, press 'Playback' in sidebar to view history from the last 30 days. You can also find info about flights from the last 30 days at www.flightradar24.com/data


However, data only shows for around 7 days and I don't see any buttons to access older data. It is not a case of FR did not pick up the older flights as I had already accessed the data when it was fresh. How can I access the 30 days of historical data please?