Legally required printouts are printouts done because your driver card is lost/stolen or faulty, and printouts done to explain a deviation from the regulations such as if you have to go over your driving time because of an unforeseeable hold-up.
No other form of manual record is legally required for the drivers hours regulations.
Printouts that you do for your own records or because of company policy are not legally required printouts and do not legally need to be kept.