Choosing external storage for backups involves genuine, real trade-offs between speed, capacity, durability, and cost — worth matching your actual choice to your genuine backup strategy rather than simply grabbing whatever’s cheapest per gigabyte.
HDD vs SSD for External Backup Storage
- External HDD — genuinely better cost-per-terabyte for large backup volumes, the standard practical choice for bulk backup storage specifically
- External SSD — meaningfully faster, more physically durable against drops and shock, but genuinely more expensive per terabyte — worth it specifically for backups you need to actually access quickly and frequently, less clearly worth it for genuinely “set it and forget it” cold, rarely-accessed backup storage
The 3-2-1 Backup Rule
3 - keep at least THREE total copies of genuinely important data
2 - store those copies on at least TWO different types of media
1 - keep at least ONE copy genuinely OFFSITE (a different physical
location entirely, protecting against fire, theft, or a
genuinely localized disaster affecting your primary location)
Why a Single External Drive Alone Is Genuinely Not Enough
An external drive sitting right next to your primary computer protects against drive failure, but genuinely not against fire, theft, or any other localized physical disaster that would affect both your primary machine and that same nearby backup simultaneously — a genuine offsite component (cloud backup, or a drive physically stored at a separate different location entirely) is what the 3-2-1 rule’s “1” specifically addresses, and it’s a real, meaningful gap a single local backup alone leaves completely uncovered.