THERE IS A NEW VERSION OF THIS PRODUCT: https://aws.amazon.com/marketplace/pp/B06Y5YM7VS/ - SoftNAS Cloud® for AWS is the leading cloud NAS on the AWS Marketplace. It extends native AWS storage (EBS, S3) to create an enterprise-class, full-featured cloud NAS filer. Safely migrate mission-critical applications to the AWS cloud without a physical storage appliance in minutes without specialized training. High-availability is included at no extra cost for AWS users who deploy the two requisite instances. Key Features: Standard Edition up to 20 Terabytes (TB), NFS, CIFS and iSCSI support, 99.999% reliability with cross-zone high-availability for private VPCs (SNAP HA®), cross-region block replication (SnapReplicate™), consistent storage pool backup/restore through EBS snapshots, Active Directory integration, compression, deduplication, thin-provisioning, easy set-up and configuration wizards, intuitive admin interface (StorageCenter™). 99.999% storage uptime, or it's free. Learn more: https://ter.li/7zyrtw

General instance size guidance: https://ter.li/d1q24u