EFS

• Managed Network File System, can be mounted on many EC2 in multi-AZ.
• Highly available, pay per use.
• Security group to control access to EFS.
• Compatible only with Linux based AMI (not Windows).
• Encrypted at rest using KMS.

Storage Tiers

• Standard

• Infrequent Access

• Archive

• Implement lifecycle policies to move files between storage tiers.