Well, yeah, the idea of individual drives is great, but in practice I've had a lot of drives die.
At 10TB, you're paying $600/year on B2, a price at which you could outright buy two 10TB drives and stick them in a larger NAS setup with ZFS or a simpler RAID-1 array.
https://www.duplicati.com does that for free being open-source thing, all platforms supported.