[CJ421]

You'll be fine as long as you are keeping your data copied somewhere (2x copies).

I bought a Western Digital Passport 2TB earlier this year on sale; it's been reliable and trouble-free so far. That drive replaced a 500GB Western Digital Passport I had for almost four years prior - no issues.
External hard drives are commodities, it's hard to go wrong as noted provided you buy a mainstream brand like Hitachi, WD, etc. Buy the base model drives; a lot of companies sell "deluxe" external hard drives which usually just include a bunch of software that they charge extra for.