EFS Elastic filesystem

Can be attached to multiple ec2 instances at once
Scales automatically on size of storage
Supports NFSv4
Works only within a Region and multiple AZs in the Region
Multi-AZ replication
Read after write consistency
Can be mounted from on-premises (unsecure without tunnels)
- Or se AWS Datasync in on-prem infra to sync data to EFS
Preserves ownership and permissions from OS
You pay for what the size you currently use
Multiple EFS’ can be in sync with with AWS DataSync

Pricing