How Do I View My Backup Storage Usage?

Log in to the management console.
Click in the upper left corner and select a region and a project.
Click in the upper left corner of the page and choose Databases > Relational Database Service.
On the Instances page, click the DB instance name.
On the Basic Information page, view the backup space usage in the Backup Space area.

Figure 1 Backup space

The storage spaces of primary and standby instances are the same because they both need to hold the same amount of data. Free backup storage equal to your purchased storage space is also provided. If free backup space is used up, the additional space will be billed. You need to configure an automated backup policy before using the backup space.