I use a Lacie Rugged Drive and I have 4TB of storage because project sizes and samples adds up quicker than you’d think.

LaCie Ruggeds are fast enough for that and are pretty durable, here is a 1tb one for 65 dollars. If you want an SSD I wouldn’t get a 1tb one for under 250 dollars.

https://www.amazon.com/LaCie-Rugged-External-Drive-Portable/dp/B0058VIWTM/ref=mp_s_a_1_3?dchild=1&keywords=lacie+1tb&qid=1591253559&sr=8-3