We use AWS for our PaaS and IaaS infrastructure. All AWS data centers are SOC 1, 2, and 3 and ISO27001 certified.
Each of our AWS locations has three physical data centers known in AWS terms as availability zones (AZs).
Data at rest is on AWS S3, consistent across all 3 AZs. Our database is replicated across 2 AZs. If our primary AZ goes down, data will remain available on S3 and our databases.
We have AIM machine images for our compute instances to bring the machines up in minutes.