This topic describes the backup storage pricing of an ApsaraDB RDS for SQL Server instance.
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.
|Backup method||Total size of backup files||Free quota in GB (rounded only up to the next integer)||Unit price (USD per GB)|
|Snapshot backup||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
You can log on to the ApsaraDB RDS console, go to the Basic Information page of your RDS instance, and view the total size of backup files in the Usage Statistics section of the page.
|Free quota = 200% × Purchased storage capacity||0.00004|
|Physical backup||Free quota = 50% × Purchased storage capacity||
The backup storage fee varies based on the total size of backup files. Backup files do not consume the storage capacity of your RDS instance. Therefore, the backup storage fee is not affected by the storage usage.
When you analyze the backup storage fee, you must check the total size of backup files. You do not need to check the storage usage.
Reduce backup storage fees
- Reduce the total size of backup files.
You can delete backup files, reduce the backup frequency, or shorten the backup retention period. For more information, see Back up an ApsaraDB RDS for SQL Server instance.
- 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 SQL Server instance.
The free quota varies based on the storage capacity of your RDS instance. For example, if you back up your RDS instance by using the physical backup method and expand the storage capacity of your RDS instance from 150 GB to 300 GB, the free quota increases from 75 GB to 150 GB.
- Purchase a DBS storage plan.
If you need to keep backup files for a long period of time and do not want to expand the storage capacity of your RDS instance, you can purchase a DBS storage plan to deduct backup costs. For more information, see Storage fees.