Amazon's Gold Box deal today is a 4TB Seagate Backup Plus hard drive for $140. This is an excellent deal. Here's why:
First, at $140 — which is at least $35 lower than the next closest price — it comes out to $35 per TB, which is a fantastic price even for bare drives. Second, this is a well-liked desktop model with USB 3.0 connectivity. The Wirecutter's Seamus Bellamy rated it as their "favorite external drive." Finally, if you've ever lost a laptop or had an onboard drive fail, you know recovering your data costs way more time and money than simply doing proper backups.