Monitor your Amazon Elastic File System (Amazon EFS) storage usage with Amazon CloudWatch

You can now monitor the storage size of your Amazon Elastic File System (Amazon EFS) resources using Amazon CloudWatch. Using the Amazon EFS or Amazon CloudWatch consoles, you can view your file system’s storage size over time, including size in each of the EFS storage classes – EFS Standard, and the cost-optimized EFS Infrequent Access.

Source:: Amazon AWS