Ensure automated backup using EFS Backup policy is enabled for AWS Elastic File System (EFS)

AWS EFS file systems do not automated backup enabled. This may compromise security and affect the availability of data.

In AWS Console -

1. Sign in to the AWS Console and go to the AWS EFS console.
2. On the File systems page, choose the file system for which to enable automatic backups. The File system details page is displayed.
3. In general tab, choose Edit.
4. Select Enable automatic backups and save.

In terraform -

1. Create 'aws_efs_backup_policy' resource and set 'file_system_id' to the corresponding EFS.
2. Set 'backup.status' to 'ENABLED'.

References:
https://docs.aws.amazon.com/efs/latest/ug/efs-backup-solutions.html
https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/efs_backup_policy