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Updated at: Apr 02, 2022 GMT+08:00

Working with Backups

RDS supports backups and restorations to ensure data reliability.

RDS uses Sysbench to import data models and a certain amount of data. After data is backed up, the compression ratio is about 80%. The more duplicate data there is, the higher the compression ratio is.

Compression ratio = Space occupied by backup files/Space occupied by data files x 100%


Although RDS supports high availability deployment, if a database or table is maliciously or mistakenly deleted, data on the standby DB instance is also deleted. In this case, backups can be used to restore DB instances.


Backups are saved as packages in OBS buckets. For the billing details, see How Is RDS Backup Data Charged?

Automated Backups

Automated backups are created during the backup time window for your DB instances. RDS saves automated backups based on a retention period you specify. If necessary, you can restore a DB instance to any point in time during your backup retention period. For details, see Configuring an Automated Backup Policy.

Once the automated backup policy is enabled, a full backup is triggered immediately. After that, full backups will be created based on the time window and backup cycle you specify. Incremental backups are automatically created every 5 minutes to ensure data reliability.

Manual Backups

Manual backups are user-initiated full backups of DB instances. They are retained until you delete them manually and will not be released with instance deletion. For details, see Creating a Manual Backup.

Full Backups

Full backups are used to back up all data even if no data was updated since the last backup.

Incremental Backups

Incremental backups refer to binlog backups. This function is enabled for RDS for MySQL DB instances by default. The system automatically backs up data updated since the last automated or incremental backup every five minutes.

Checking and Exporting Backup Information

You can export backup information of DB instances to an EXCEL file for further analysis. The exported information includes the DB instance names, backup start and end times, backup statuses, and backup sizes. For details, see Checking and Exporting Backup Information.

Downloading a Backup File

You can download a full or an incremental backup file for local data backup or restoration. For details, see Downloading a Full Backup File and Downloading a Binlog Backup File.

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