We have done this calculation and even if you put your gear into Equinix/Digital Realty in the most expensive places and use Backblaze-type setup ( which is no

We have done this calculation and even if you put your gear into Equinix/Digital Realty in the most expensive places and use Backblaze-type setup ( which is not optimized and buying retail) bringing 10Gbit to every 4U the price for double-writes at 5TB disks are $10/year per TB.