ᐅ How can mold growth be prevented on BILLY shelves in a basement?

Hello everyone, I have relatively new Billy shelves from IKEA in my basement and have noticed a slight buildup of moisture and occasional mold spots on the back panels of the shelves as well as sometimes on the shelves themselves. My question is very specific: What is the most effective way to prevent mold growth on Billy shelves in a basement, especially when the humidity level is higher? What preventive measures have proven effective in terms of storage, air circulation, and material protection? Are there any special tricks involving treatments for the shelves or back panels? I look forward to any tips or experiences!