This topic describes how to view the free quota for backup storage of an ApsaraDB RDS for MySQL instance. Each RDS instance is allocated with a free quota for backup storage. If the total size of your data and log backup files exceeds the free quota, you are charged an hourly rate for your excess backup storage usage based on the pay-as-you-go billing method.

Free quota

If your RDS instance uses standard or enhanced SSDs, the free quota is calculated based on the following formula: Free quota = 200% × Purchased storage capacity (unit: GB; rounded up to the next integer).

If your RDS instance uses local SSDs, the free quota is calculated based on the following formula: Free quota = 50% × Purchased storage capacity (unit: GB; rounded up to the next integer).

The excess backup storage usage is calculated based on the following formula: Excess backup storage usage = Size of data backup files + Size of log backup files - Free quota.

For example, your RDS instance uses local SSDs. In addition, the size of data backup files is 30 GB, the size of log backup files is 10 GB, and the storage capacity that you have purchased for your RDS instance is 60 GB. In this case, you are charged an hourly rate for 10 GB of excess backup storage based on the following calculation: Excess backup storage usage = 30 + 10 - 50% × 60 = 10 (GB).

Unit price

For more information about the hourly rate that you are charged for your excess backup storage usage, visit the ApsaraDB RDS pricing page. On the ApsaraDB RDS pricing page, find the Additional Function section and view the Backup item.

Unit price for backup storage usage on the international site

Procedure

  1. Go to the Basic Information page.
    1. Log on to the ApsaraDB for RDS console. In the left-side navigation pane, click Instances. In the top navigation bar, select the region where your RDS instance resides.
      选择地域
    2. Find your RDS instance and click its ID. In the left-side navigation pane of the page that appears, click Basic Information.
  2. In the Usage Statistics section of the page, view the free quota to the right of the Backup Size parameter.
    Usage Statistics section

FAQ

  • Do backup files occupy the storage capacity that I have purchased for my RDS instance?

    No, backup files do not occupy the storage capacity that you have purchased for your RDS instance. The backup storage space is isolated from the storage space.

  • Can I purchase backup storage space based on the subscription billing method?

    No, you cannot purchase backup storage space based on the subscription billing method.