EFS Backup Retention
For EFS file system backups, Veeam Backup for AWS retains restore points for the period of time specified in backup schedule settings.
During every successful backup session, Veeam Backup for AWS creates a restore point and saves the date, time and the applied retention settings in the restore point metadata. If Veeam Backup for AWS detects that the period of time for which the restore point was stored exceeds the period specified in the retention settings, it automatically removes the restore point from the EFS backup chain. You can also remove unnecessary EFS backups manually as described in section Removing Backups.
Mind that Veeam Backup for AWS does not apply retention policy to EFS backups created manually. For details on how to remove them, see section Removing Backups Created Manually.