The property thucydides.take.screenshots can be set to configure how often the sreenshots are taken. This property can take the folowing values:
FOR_EACH_ACTION : Saves a screenshot at every web element action (like click(), typeAndEnter(), type(), typeAndTab() etc.).
BEFORE_AND_AFTER_EACH_STEP : Saves a screeshot before and asfter every step.
AFTER_EACH_STEP : Saves a screenshot after every step
FOR_FAILURES : Saves screenshots only for failing steps. This can save disk space and speed up the tests a little. It is very useful for data-driven testing.