EFS is a fully-managed service that makes it easy to set up and scale file storage in the
Amazon Cloud
EFS filesystems are mounted using the NFS protocol (which is a file-level protocol)
Access to EFS file systems from on-premises servers can be enabled via Direct Connect or AWS
VPN
You mount an EFS file system on your on-premises Linux server using the standard Linux mount
command for mounting a file system via the NFSv4.1 protocol
Amazon S3 is an object-level not file-level storage system
Amazon Glacier is an archiving solution that is accessed through S3
Amazon Elastic Block Storage (EBS) is block-level storage that can only be accessed by EC2
instances from the same AZ as the EBS volume