EFS Cleanup Idle Filesystems

Opportunity Name:

EFS Cleanup Idle Filesystems


AWS Resource Type:

Amazon Elastic File System (EFS)


Opportunity Description:

This opportunity identifies EFS instances that have been idle for greater than 30 days, creates a backup, and deletes the file system. 


Criteria for identifying the opportunity:

Opportunities for EFS instances should meet one of the following criteria:

  • no active mounts or mount removals from EFS clients in the last 30 days
  • has active mounts with no active client connections in the last 30 days


Potential savings (range in % on annual basis):

Potential savings vary depending on the storage class of the file system, how the backup is stored, and how long the backup is retained for.  Our initial findings suggest users could save as much as 11% on their annualized EFS costs.


What happens when the Fixer is executed?

The Fixer first removes any active mounts associated with the EFS instance.  Then, the Fixer uses AWS Backup to create a backup of the EFS instance. This backup is retained indefinitely in warm storage using a vault called “cloudfix-vault”.  Once the backup process is complete, the Fixer deletes the EFS instance.

To use AWS Backup to create a backup of EFS instance, you must affirmatively opt in. Opt-in choices apply to the specific account and AWS Region, so you might have to opt in to multiple Regions using the same account. See this AWS article for opt-in instructions.

Users are free to remove or configure their own lifecycle policies for the backup that is created - see this AWS article for further information.


Is it possible to rollback once CloudFix implements the fixer?

Yes. A user can do a manual rollback by executing the `Cloudfix-Runbook-EfsCleanupIdleFileSystems-Rollback-prod` runbook. The user must provide the ARN of the recovery point in AWS Backup created by the Fixer runbook. 


Can CloudFix implement the fix automatically once I accept the recommendation?



Does this fix require downtime?

No, given the target file systems have been identified as idle.


Additional Resources:




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