for Windows File Server

The Windows’ AWS EFS,

Fully managed native Windows File Servers/shares, supports windows permissions
Native windows file system.
- For example support shadow copies (VSS) and DFS and ..
Integrates with Directory Service and self managed AD.
Resilient and Business Resilience and Reliability > High availability (HA), backed replicates data to enable that.
Can work in Single and Multi-AZ modes.
On-demand and Scheduled backups
Accessible using VPC, Peering, VPN (AWS Site-to-Site VPN) and AWS Direct Connect (DX)

for Lustre

Managed Lustre - Designed for HPC - LINUX Clients, supports (POSIX) permissions
Machine Learning, Big Data, Financial Modelling
100’s GB/s throughput & sub millisecond latency
Deployment types - Persistent or Scratch
Scratch - Highly optimised for Short term no replication & fast, no HA.
Persistent - longer term, HA (in one AZ), self-healing, if whole AZ fail, bye bye data
Can be used with AWS Site-to-Site VPN or AWS Direct Connect (DX)

Data is stored on FS only when precessed (Lazy Loaded from AWS S3 Simple Storage Service), when not used it is stored on S3. Processed data can be backed up to S3 with hsm_archive and automatically on schedule Working with backups - FSx for Lustre