Drives and more drives

As a DJ it is important to have an abundance of music! I have so many drives of music it is overwhelming. I need to buy a few 4TB hard drives to back up all of my thumb drives and external drives.
Once I get the back up drives it will give me the opportunity to organize everything. I want to get to the point where each thumb drive is dedicated to a particular genre. It would make my life easier when it comes to specific parties. For an example, I have to DJ a 13 year old birthday party. They dont want to hear anything other than Hip Hop and R&B between 2005-present. Knowing that I would grab my Hip Hop and R&B drives and call it a day! No sense on bringing a drive full of Machata and Salsa lol