Western Digital are marking World Backup Day (March 31) with numerous digital storage discounts. They include free extended warranties, bundle savings, a free case with a My Passport purchase, as well as straight discounts on internal and external hard drives. We've pictured the bundle of two WD Red Pro 18TB NAS Hard Drives for $549.98 (low by $150). Shipping adds $7.98, but orders of $50 or more get free shipping. Shop Now at Western Digital