With AWS a region has more than one availability zone.
aws ec2 describe-availability-zones --region ap-south-1 for example shows two datacenters in mumbai.
Across physical site security, to power to network to just hard drive and system decommissioning, more than 6 staff.
I wonder if this is partly why AWS has done so well. I've used colo and hosted providers who do seem to have basically no one actually on site.