Backwardation in the monetary metals is pretty rare. We have been seeing day after day this condition in silver and gold. You can compare the futures price of silver or gold to the spot price and see the backwardation. It is where the futures price is either at the spot price or below it. The last time this occurred was in March 2020. Late 2015  was the period before that. Before that it was early 2011. Each of these periods preceded huge runs in the precious metals.