In the tower I built last year I have four 2TB NVMe drives for samples, and I also put an 8TB regular spinning HD in there as the dedicated backup drive. Anytime there’s and update or I buy something new (something I’m trying to avoid for now, lol), I just run the backup script I created and it saves any changes or new files.
You didn’t mention if you have a tower or laptop, or if it’s Mac or PC. If you’re running a laptop or a MacBook, a NAS unit (Network Attached Storage) is a great solution since it connects to your network, nothing to plug into your laptop. If you have a Mac, you can use time machine to manage the backups to the unit. It’s nice, any computer you have can access the NAS and be your master back up system. I use a Synology unit with four 12TB drives which gives me essentially a 24TB drive on my network (before formatting) with the data being written across multiple drives. The one drawback is the upfront cost since it’s the unit plus whatever 4 huge hard drives you buy. It’ll get over $1,000 easily to set up a NAS but once done it’s a nice data vault that doesn’t need a USB cable. If you want to know more, I can provide links, etc.