I'm assuming Google's paying about 5x what the hdds alone cost, which I guess would cover backups, infrastructure besides the hdd cost, power, and software. But

I'm assuming Google's paying about 5x what the hdds alone cost, which I guess would cover backups, infrastructure besides the hdd cost, power, and software. But it could be more than that. 15x the cost of hdds seems high, but storage could be that expensive for them.