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You probably mean backwards in comparison to 'normal' excavators used in construction, which are designed for digging a hole in a flat ground. But in this type of mining operation, the process is slightly different - simply said this excavator already starts it's work in a pre-made hole and then works against it's walls, enlarging it to sides. So they mount the bucket like this, because it's much more effective for digging material from a near-vertical surface.