I agree but... (Score 5, Informative)

I agree, I've been using Crashplan for three years and the unlimited space it's really great BUT... ...I'm not sure about the bandwidth they provide: how long it will take to upload 20 TB? Anyway, I don't see what's the problem in using external drives for backup. Here in my lab I've realized that the best way to backup X Terabytes is to have another storage with X Terabytes...