Each ApsaraDB RDS for MariaDB instance includes a free quota for backup storage. If your total backup size exceeds this quota, you are charged an hourly rate for the excess. This topic explains how the free quota is calculated and how to check it in the console.
How it works
Backup files are stored in backup storage, which is separate from the storage capacity you purchase when you create an instance.
ApsaraDB RDS for MariaDB instances use cloud disks and support only snapshot backups. The free quota is calculated as follows:
Free quota = 200% x purchased storage capacity (GB), rounded up to the nearest integer
If your total backup size exceeds the free quota, you pay an hourly rate for the excess:
Excess backup storage = data backup size + log backup size - free quota
Example
| Item | Value |
|---|---|
| Purchased storage capacity | 60 GB |
| Free quota (200% x 60) | 120 GB |
| Data backup size | 150 GB |
| Log backup size | 50 GB |
| Excess backup storage | 150 + 50 - 120 = 80 GB |
You are billed at an hourly rate for the 80 GB excess.
For pricing details, see ApsaraDB for RDS.
For RDS Basic Edition instances, some database engines support a seven-day free retention period for backup files. Check the ApsaraDB RDS console for details.
View the free quota in the console
Go to the Instances page. In the top navigation bar, select the region where your RDS instance resides. Find the instance and click its ID.
In the Usage Statistics section, find Backup Size. The free quota is displayed to the right.
NoteThe free quota varies based on the instance configuration.
FAQ
Do backup files occupy the storage I purchased?
No. Backup files are stored in backup storage, which is independent of the storage capacity you purchase during instance creation.
Can I purchase backup storage on a subscription basis?
No. Backup storage cannot be purchased on a subscription basis. The free quota is allocated automatically based on your purchased storage capacity, and any excess is billed at an hourly pay-as-you-go rate.