JLG 450 AJ safety question

As I get a little older, I have gotten more cautious. I have often wondered what would happen if a hydraulic line to the main boom, secondary boom or jib were to burst, would the lift just crash to the ground or (as I hope) is there a sufficient back-up system where I don't need to worry about this. The hoses all look good but this question still enters my mind often.

JLG 450 AJ safety question