Help Center/ Relational Database Service_RDS for SQL Server/ FAQs/ Backup and Restoration/ How Are Unsynchronized Backups Generated for RDS for SQL Server Instances?

Updated on 2025-09-09 GMT+08:00

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How Are Unsynchronized Backups Generated for RDS for SQL Server Instances?

Unsynchronized backups are generated only for Microsoft SQL Server 2017 Enterprise Edition DB instances. If a primary DB instance fails, the standby DB instance is promoted to be the new primary instance. During the failover, a small amount of data may not be synchronized and a differential backup is created for user-created databases on the original primary DB instance. You can use the unsynchronized backup and the last backup to restore data.

To obtain the most recent backup, submit a service ticket to contact customer service.

Parent Topic: Backup and Restoration

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