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The old backup retention period is fixed to seven days and you cannot change it. This cannot satisfy the customers who have Multi-Level Protection Scheme (MPLS) requirements and want backup retention periods of more than 30 days. ApsaraDB MongoDB supports custom backup retention periods to ensure high data reliability and meet MPLS requirements. The backup retention period range is 7 to 730 days. The default value is changed from 7 days to 30 days. Take note of the following points: If the backup retention period is very long, the free quota for backup resources may be exceeded and you are charged for additional fees. If the backup retention period is very short, previous data may not be restored.