HDDs are heavy and require a lot of room. I used to run two 2TB and one 4TB HDDs in my desktop machine for data drives and had a set of four more backup HDDs for each data drive in my computer: two in each set were kept onsite (aka home) and the other two in the set were kept offsite in my safe...
High capacity; inceased speed; lower weight; smaller size; lower power consumption; runs cooler than HDDs; dead quiet; five year warranty
Price is higher than a kite