It's important to understand the big picture so you can evaluate for yourself the reliability of a service like Prefab.cloud, so here's the big picture architecture overview.
Prefab's API lives in GCP us-central1. Services are running in 3 Availability Zones at all times.
Prefab relies on Amazon's DynamoDB for it's underlying storage. DynamoDB synchronously replicates to three facilities. Read more about DynamoDB Reliability.
For increased resiliency in the event of your services being unable to reach Prefab.Cloud APIs, config checkpoints are also in S3 allowing clients to bootstrap off this highly available source. This is available for plans with "Redundant Backends". Read more about Config Store Reliability
Prefab relies on Amazon's DynamoDB for it's underlying storage of rate limits. DynamoDB synchronously replicates to three facilities. Read more about DynamoDB Reliability.
For improved performance, Prefab puts Redis in front of DynamoDB by default. In some failure scenarios this could lead to stale values being served. For use cases with no tolerance for this you may use a Level 5 RateLimit.
Prefab.cloud relies on GRPC for lightning fast and reliable network clients.