This topic describes how to view the quota of free backup space for an ApsaraDB RDS for MySQL instance and how to calculate the backup space usage beyond the quota. The quota varies based on the database engine version and RDS edition used.

Backup files occupy backup space. Each RDS instance is allocated a quota of free backup space. If the total size of backup files exceeds the quota, additional fees are incurred.

Calculate the quota of free backup space and the backup space usage beyond the quota

RDS for MySQL instances equipped with standard or enhanced SSDs support only snapshot backups. The quota that is allocated to store snapshot backups is calculated based on the following formula: Quota = 200% × Storage capacity purchased during instance creation (unit: GB; rounded up).

RDS for MySQL instances equipped with local SSDs support both physical and logical backups. The quota that is allocated to store physical and logical backups is calculated based on the following formula: Quota = 50% × Storage capacity purchased during instance creation (unit: GB; rounded up).

The backup space usage beyond the quota is calculated based on the following formula: Backup space usage beyond the quota= Data backup volume + Log backup volume - Quota.

For example, if the data backup volume is 30 GB, the log backup volume is 10 GB, and the storage capacity purchased during instance creation is 60 GB, then the hourly rate of backup space usage beyond the quota is calculated as follows: Hourly rate of backup space usage beyond the quota = 30 + 10 - 50% × 60 = 10 (GB). This means that you must pay for an additional 10 GB of storage space per hour.

Note
  • For more information about the hourly rate of backup space usage beyond the quota, see the pricing information at ApsaraDB for RDS.
  • The Basic Edition used with some database engines allows you to store backups that are generated during the last seven days. The storage is free of charge. For more information, go to the ApsaraDB for RDS console.Basic Edition screenshot

View the quota of free backup space in the ApsaraDB for RDS console

  1. Log on to the ApsaraDB for RDS console.
  2. In the top navigation bar, select the region where the target RDS instance resides.Select a region
  3. Find the target RDS instance and click its ID to open the Basic Information page.
  4. In the Usage Statistics section at the lower part of the page, view the quota of free backup space to the right of Disk Size.
    Note The quota of free backup space varies based on the database engine version and RDS edition. The following figure only shows an example.

FAQ

  • Will backup files occupy the storage space that I purchased during instance creation?

    No, backup files do not occupy the storage space that you purchased during instance creation.

  • Can I purchase subscription-billed backup space?

    No, you cannot purchase backup space.