I am considering the needs of the OP when I recommend USB thumb drives for primary data backup.

Personally, I use them. I also use USB disk drives, and I have a stack of bare SATA drives as well. The bare SATA drives are the cheapest high-capacity solution, and one which I would NEVER recommend to most users, and certainly not to the OP.

No offense intended to Mr. 420. He will tell you that he's not a power user.