That's the right thing to do @atún89, save one part and invest the other. Personally I would not risk investing all the capital even if such investment is low or zero risk. In case of an emergency it is always good to have capital available.As for me, I think I would prefer both options, I save a part of my earnings and invest a part of it, with respect to the investment I will save some part of the profits and invest part of it.