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Garage
Our S3-compatible object storage service is based on Garage.
Garage is running as a cluster, with one VM each on 3 different physical hosts in 2 different zones (data centers).
Replication mode is set to "2", meaning PUTs are always immediately synced to nodes in 2 different zones (write/read consistency guaranteed by default).
When all nodes in one zone become unavailable, the cluster is switching to read-only mode automatically, since the write quorum cannot be reached in that case. If it is necessary (in an emergency) to write to nodes in only one zone, you can change the replication mode to "2-dangerous", which lowers the write quorum to 1.
Please refer to the replication documentation for more detailed information.