B&H Photo Video offers the Seagate 4TB Backup Plus USB 3.0 External Hard Drive, model no. STCA4000100, for $179.99 with free shipping. That’s $0.04/GB, $20 under our mention from two weeks ago, and the lowest total price we could find by $30 It’s compatible with Windows and Mac, backwards compatible with USB 2.0, and features two backup scheduling options, social network sharing, and more.