SDDC storage capacity and data redundancy scale with the number of nodes in the SDDC.
Single node SDDCs provide no data redundancy. SDDCs with more nodes support data redundancy through various RAID configurations. All SDDC storage provides data deduplication, data compression, or both. Data redundancy in SDDCs that have more than one host is expressed as a number of failures to tolerate (FTT), where a failure can be the loss of a single host in a cluster or a single storage device in an array.
All RAID configurations consume data to support redundancy. You can calculate the projected capacity needs for your workloads based on the host instance type, cluster configuration, and failure tolerance settings using the VMware Cloud on AWS Sizer and TCO tool found at https://vmc.vmware.com/sizer/workload-profiles.