Performing EFS Backup
One backup policy can be used to process one or more EFS file systems within one AWS account. The scope of data that you can protect in an AWS account is limited by permissions of an IAM role that is specified in the backup policy settings.
If you plan to receive email notifications on backup policy results, configure SMTP server settings first before creating an EFS backup policy. For more information, see Configuring Global Notification Settings.
For EFS systems residing in any of the regions added to the backup policies, you can also take a backup manually when needed.
You can back up EFS file systems only to the same AWS accounts where the source file systems belong.