This topic describes the backup storage pricing of an ApsaraDB RDS for PostgreSQL instance.

Billing

A free quota on storage is provided for each RDS instance to store backup files. If the total size of the backup files of your RDS instance does not exceed the free quota, no fees are charged. If the total size exceeds the free quota, you are charged an hourly fee for the excess backup storage that you use. The hourly fee is calculated by using the following formula: Hourly fee for backup storage = (Total size of backup files - Free quota) × Unit price of storage.

Total size of backup files

The total size of backup files is calculated by using the following formula: Total size of backup files = Size of data backup files + Size of log backup files.

Note You can log on to the ApsaraDB RDS console and go to the Basic Information page of your RDS instance. Then, you can view the total size of backup files in the lower-right corner of the page.
Free quota
Backup method Free quota in GB (rounded up to the next integer) Description
Snapshot backup If your RDS instance uses standard SSDs or enhanced SSDs (ESSDs), the free quota is equal to 200% of the storage capacity of your RDS instance. You can log on to the ApsaraDB RDS console and go to the Basic Information page of your RDS instance. Then, you can view the free quota on the backup storage in the lower-right corner of the page. For more information, see View the free quota for backup storage of an ApsaraDB RDS for PostgreSQL instance.
Physical backup If your RDS instance uses local SSDs, the free quota is equal to 50% of the storage capacity of your RDS instance.
Unit price
Backup method Unit price (USD per GB)
Snapshot backup 0.00004
Physical backup 0.00020

Usage notes

The backup fees are based on the total size of backup files. Backup files do not consume the storage capacity of your RDS instance. Therefore, the backup fees do not vary based on the storage usage.

When you analyze the backup fees, you must check the total size of backup files. You do not need to check the storage usage.

Methods to reduce the backup fees

  • Increase the free quota.

    You can expand the storage capacity of your RDS instance. For more information, see Change the specifications of an ApsaraDB RDS for PostgreSQL instance.

    The free quota varies based on the storage capacity of your RDS instance. If your RDS instance uses local SSDs and you expand the storage capacity of your RDS instance from 150 GB to 300 GB, the free quota is increased from 75 GB to 150 GB.

FAQ

  • Why am I charged for backup storage even if the total size of the backup files of my RDS instance does not exceed the free quota for backup storage?

    You are charged for backup storage because the size of the backup files exceeded the free quota in the past.

  • The backup retention period of my RDS instance is shortened from x days to y days. Why does the size of backup files remain unchanged?

    If no backup files are retained for more than y days, after you shorten the backup retention period, no backup files are deleted. The size of backup files remains unchanged.