External hard drive shopping often focuses on capacity at the expense of reliability. Larger drives don't automatically serve your needs better if they fail unexpectedly. Backup strategy should drive your purchase decision, not available shelf space.
Transfer speeds vary significantly between models and connection types. USB 3.1 drives deliver faster performance than older standards, but actual throughput depends on the drive mechanism inside. Solid-state external drives cost more but provide speed and durability advantages for professional work.
Brand reputation correlates with failure rates, though no manufacturer achieves perfect reliability. Research real-world failure statistics before choosing. Consider whether a drive will be stationary or portable; mobile drives need more robust shock protection than desk-based units.
Backup redundancy trumps single-drive solutions. Relying on one external drive creates single-point failure risk. Professional workflows benefit from multiple drives stored separately. Consumer backup strategies should include at least two independent copies of important files.