PolarDB allows you to use the backup and restoration features free of charge, but you are charged for backup storage based on the size and retention period of backup files. This topic describes the billing rules for backup storage.
Billing rules for backup storage of Standard Edition clusters
Free quota
PolarDB Standard Edition clusters provide a free quota for backup storage. After the free quota is exhausted, you are charged based on the size and the retention period of the backup files.
Backup type | Free quota |
Backup type | Free quota |
Data backup | Cluster storage usage × 50% |
Log backup | 100 GB |
Billing rules
Regions in the Chinese mainland | China (Hong Kong) and regions outside China | Billing method |
Regions in the Chinese mainland | China (Hong Kong) and regions outside China | Billing method |
USD 0.000032 per GB-hour | USD 0.000045 per GB-hour | Backup storage fee per hour = Total size of backup files × Unit price per hour For example, if the total size of backup files of a PolarDB for PostgreSQL cluster deployed in the Chinese mainland is 1000 GB, the backup storage fee per hour is USD 0.032. The backup storage fee is calculated by using the following formula: 1,000 GB × USD 0.000032/GB/hour = USD 0.032/hour. |
Use storage plans to offset data backup fees
You can use storage plans to offset data backup fees. If your storage plans do not have sufficient capacity to offset the data backup storage usage, you are charged for the excess storage usage based on the pay-as-you-go billing method.
The following table describes the offset rules.
Region | Offset ratio | Data backup storage usage offset by a 1-GB storage plan |
Region | Offset ratio | Data backup storage usage offset by a 1-GB storage plan |
Region in the Chinese mainland | 0.043 | 1/0.043=23.26 GB |
China (Hong Kong) and regions outside China | 0.054 | 1/0.054=18.52 GB |
For example, if you purchase a 100-GB storage plan and 50 GB of the plan is used to offset the storage usage of the cluster, the storage plan has 50 GB of remaining capacity. If your cluster consumes an additional 50 GB of storage space for data backups in a region in the Chinese mainland, 2.15 GB (50/23.26) from the storage plan is automatically used to offset this storage usage. As a result, the storage plan has 47.85 GB of remaining capacity.
If the remaining capacity of the storage plan is insufficient to offset the data backup storage usage, you are charged for the excess storage usage based on the pay-as-you-go billing method.
For more information about storage plans, see FAQ about billing for storage plans.
Use storage plans to offset log backup storage fees
You can use storage plans to offset log backup storage fees. If the storage plans do not have sufficient capacity to offset the log backup storage usage, you are charged for the excess storage usage based on the pay-as-you-go billing method.
The following table describes the offset rules.
Region | Offset ratio | Log backup storage usage offset by a 1-GB storage plan |
Region | Offset ratio | Log backup storage usage offset by a 1-GB storage plan |
Region in the Chinese mainland | 0.043 | 1/0.043=23.26 GB |
China (Hong Kong) and regions outside China | 0.054 | 1/0.054=18.52 GB |
For example, if you purchase a 100-GB storage plan and 50 GB of the plan is used to offset the storage usage of the cluster, the storage plan has 50 GB of remaining capacity. If your cluster consumes an additional 50 GB of storage for log backups in a region in the Chinese mainland, 2.15 GB (50/23.26) from the storage plan is automatically used to offset this storage usage. As a result, the storage plan has 47.85 GB of remaining capacity.
If the remaining capacity of the storage plan is insufficient to offset the log backup storage usage, you are charged for the excess storage usage based on the pay-as-you-go billing method.
For more information about storage plans, see FAQ about billing for storage plans.
Billing rules for backup storage of Enterprise Edition clusters
Free quota
PolarDB offers a free quota for backup storage. After the quota is exhausted, you are charged based on the size and retention period of backup files in intra-region backup scenarios. In across-region backup scenarios, in addition to the backup storage fee, a cross-region network traffic fee is also generated.
Backup type | Free quota | |
Backup type | Free quota | |
Data backup | Level-1 backup | Cluster storage usage × 50% For information about how to view the cluster storage usage, see View the database storage usage. |
Level-2 backup | N/A | |
Log backup | 100 GB | |
You can enable the storage compression feature for PolarDB Enterprise Edition clusters. For more information, see Enable the storage compression feature. The following rules for the free quota of level-1 backup storage apply after you enable the storage compression feature. For more information about the free quota of level-1 backup storage of a cluster, see Billing rules for backup storage that exceeds the free quota.
If the storage of the cluster is billed based on the pay-as-you-go billing method, the free quota of level-1 backups after you enable the storage compression feature is calculated by using the following formula: Storage usage of the database before compression × 50%.
If the storage of the cluster is billed based on the subscription billing method, the free quota of level-1 backups after you enable the storage compression feature is calculated by using the following formula: Max (subscription-billed storage capacity, storage usage of the database before compression) × 50%.
Example:
The storage of a cluster is billed based on the subscription billing method, the subscription-billed storage capacity of the cluster is 2 TB, and the storage usage of the cluster is 1.6 TB. After you enable the storage compression feature, the storage usage of the cluster is compressed to 0.5 TB.
Billing rules
Backups include level-1 backups, level-2 backups, and log backups. Prices vary based on the backup type.
The free storage quota for level-1 backups is 50% of the cluster storage usage. After the free quota is exhausted, you are charged based on the additional storage usage and retention period of the level-1 backups. The following table describes the prices.
Storage type
Region in the Chinese mainland
China (Hong Kong) and regions outside China
Billing method
Storage type
Region in the Chinese mainland
China (Hong Kong) and regions outside China
Billing method
PSL5
USD 0.000464 per GB-hour
USD 0.000650 per GB-hour
Storage fee per hour = (Total size of level-1 backups - Free quota) × Unit price per hour
For example, a PolarDB for PostgreSQL cluster deployed in the Chinese mainland uses the PSL5 storage type. If the total size of level-1 backups (snapshots) is 700 GB and the cluster storage usage is 1,000 GB, the level-1 backup storage fee per hour is USD 0.0928.
The fee is calculated by using the following formula: [700 GB - (1,000 GB × 50%)] × USD 0.000464 per GB-hour = USD 0.0928.
For information about how to view the size of level-1 backups, see FAQ.
PSL4
USD 0.0003 per GB-hour
USD 0.000433 per GB-hour
You can implement level-2 backup across different zones in the same region or across different regions. In intra-region backup scenarios, you are charged based on the size and retention period of level-2 backup files. In cross-region backup scenarios, in addition to the level-2 backup storage fee, a cross-region network traffic fee is also generated.
Billing rules for intra-region level-2 backup
Region in the Chinese mainland
China (Hong Kong) and regions outside China
Billing method
Region in the Chinese mainland
China (Hong Kong) and regions outside China
Billing method
USD 0.0000325 per GB-hour
USD 0.0000455 per GB-hour
Storage fee per hour = Total size of level-2 backups × Unit price per hour
For example, a PolarDB for PostgreSQL cluster is deployed in the Chinese mainland. If the total size of level-2 backups is 1,000 GB, the level-2 backup storage fee per hour is USD 0.0325.
The fee is calculated by using the following formula: 1,000 GB × USD 0.0000325/GB/hour = USD 0.0325.
Billing rules for cross-region level-2 backup
Billable item
Region in the Chinese mainland
China (Hong Kong) and regions outside China
Billing method
Billable item
Region in the Chinese mainland
China (Hong Kong) and regions outside China
Billing method
Level-2 backup storage
USD 0.0000325 per GB-hour
USD 0.0000455 per GB-hour
Storage fee per hour = Total size of level-2 backups × Unit price per hour + cross-region network traffic fee
For example, a cross-region level-2 backup is performed between regions in the Chinese mainland. If the total size of level-2 backups is 1,000 GB and the consumed cross-region network traffic is 500 MB, the level-2 backup storage fee per hour is USD 0.0691.
The fee is calculated by using the following formula: 1,000 GB × USD 0.0000325/GB/hour + 500 MB/1024 × USD 0.075/GB = USD 0.0691.
Cross-region network traffic
For information about the cross-region network traffic fees, see Network traffic fees.
Cross-region backup is billed on a daily basis. In this example, the daily prices are converted into hourly rates for convenience.
Fees for cross-region backup are recorded in Data Disaster Recovery bills.
You can implement log backup across different zones in the same region or across different regions. In intra-region log backup scenarios, you are charged based on the size and retention period of log backup files. In cross-region log backup scenarios, in addition to the log backup storage fee, a cross-region network traffic is also generated.
Billing rules for intra-region log backup
Region in the Chinese mainland
China (Hong Kong) and regions outside China
Billing method
Region in the Chinese mainland
China (Hong Kong) and regions outside China
Billing method
USD 0.0000325 per GB-hour
USD 0.0000455 per GB-hour
Storage fee per hour = (Total size of log backups - 100 GB) × Unit price per hour
For example, a PolarDB for PostgreSQL cluster is deployed in the Chinese mainland. If the total size of log backups is 1,000 GB, the log backup storage fee per hour is USD 0.02925.
The fee is calculated by using the following formula: (1,000 GB - 100 GB) × USD 0.0000325 per GB-hour = USD 0.02925.
Billing rules for cross-region log backup
Billable item
Region in the Chinese mainland
China (Hong Kong) and regions outside China
Billing method
Billable item
Region in the Chinese mainland
China (Hong Kong) and regions outside China
Billing method
Log backup storage
USD 0.0000325 per GB-hour
USD 0.0000455 per GB-hour
Storage fee per hour = Total size of log backups × Unit price per hour + Cross-region network traffic fee.
For example, a cross-region log backup is performed between regions in the Chinese mainland. If the total size of log backups is 1,000 GB and the consumed cross-region network traffic is 500 MB, the log backup storage fee per hour is USD 0.0659.
The fee is calculated by using the following formula: (1,000 GB - 100 GB) × USD 0.0000325 per GB-hour + 500 MB/1024 × USD 0.075/GB = USD 0.0659
Cross-region network traffic
For more information about cross-region network traffic fees, see Network traffic fees.
Cross-region backup is billed on a daily basis. In this example, the daily prices are converted into hourly rates for convenience.
Fees for cross-region backup are recorded in Data Disaster Recovery bills.
Storage plan offset rules
Use storage plans to offset level-1 backup storage fees
You can use a storage plan to offset the level-1 backup storage usage that exceeds the free quota. If the capacity of the storage plan is insufficient to offset the level-1 backup storage usage, you are charged for the excess storage usage based on a pay-as-you-go basis.
The following table describes the offset rules.
Region | Offset ratio | Level-1 backup storage usage offset by a 1-GB storage plan |
Region | Offset ratio | Level-1 backup storage usage offset by a 1-GB storage plan |
Region in the Chinese mainland (PSL4) | 0.41 | 1/0.41=2.44 GB |
Region in the Chinese mainland (PSL5) | 0.617 | 1/0.617=1.62 GB |
China (Hong Kong) and regions outside China (PSL4) | 0.41 | 1/0.41=2.44 GB |
China (Hong Kong) and regions outside China (PSL5) | 0.617 | 1/0.617=1.62 GB |
For example, if you purchase a 100-GB storage plan and 50 GB is used to offset the PSL5 storage usage of the cluster, the storage plan has 50 GB of capacity remaining. If your cluster consumes an additional 50 GB of storage beyond the free quota for level-1 backup storage in a region in the Chinese mainland, 31.25 GB (50/1.6 = 31.25) of the storage plan automatically offsets the level-1 backup storage usage. As a result, the storage plan has 18.75 GB of capacity remaining.
If the remaining capacity of the storage plan is insufficient to offset the level-1 backup storage usage, you are charged for the excess storage usage on a pay-as-you-go basis.
For more information about storage plans, see FAQ about billing for storage plans.
Use storage plans to offset level-2 backup storage fees
You can use storage plans to offset level-2 backup storage usage. If the capacity of the storage plans is insufficient to offset the level-2 backup storage usage, you are charged for the excess storage usage on a pay-as-you-go basis.
The following table describes the offset rules.
Region | Offset ratio | Level-2 backup storage usage offset by a 1-GB storage plan |
Region | Offset ratio | Level-2 backup storage usage offset by a 1-GB storage plan |
Region in the Chinese mainland | 0.043 | 1/0.043=23.26 GB |
China (Hong Kong) and regions outside China | 0.054 | 1/0.054=18.52 GB |
For example, if you purchase a 100-GB storage plan and 50 GB of the plan is used to offset the storage usage of the cluster, the storage plan has 50 GB of remaining capacity. If your cluster consumes an additional 50 GB of storage for level-2 backups in a region in the Chinese mainland, 2.15 GB (50/23.26) of the storage plan is automatically used to offset the level-2 backup storage usage. As a result, the storage plan has 47.85 GB of capacity remaining.
If the remaining capacity of the storage plan is insufficient to offset the level-2 backup storage usage, you are charged for the excess storage usage on a pay-as-you-go basis.
For more information about storage plans, see FAQ about billing for storage plans.
Use storage plans to offset log backup storage fees
You can use storage plans to offset log backup storage fees. If the storage plans do not have sufficient capacity to offset the log backup storage usage, you are charged for the excess storage usage based on the pay-as-you-go billing method.
The following table describes the offset rules.
Region | Offset ratio | Log backup storage usage offset by a 1-GB storage plan |
Region | Offset ratio | Log backup storage usage offset by a 1-GB storage plan |
Region in the Chinese mainland | 0.043 | 1/0.043=23.26 GB |
China (Hong Kong) and regions outside China | 0.054 | 1/0.054=18.52 GB |
For example, if you purchase a 100-GB storage plan and 50 GB of the plan is used to offset the storage usage of the cluster, the storage plan has 50 GB of remaining capacity. If your cluster consumes an additional 50 GB of storage for log backups in a region in the Chinese mainland, 2.15 GB (50/23.26) from the storage plan is automatically used to offset this storage usage. As a result, the storage plan has 47.85 GB of remaining capacity.
If the remaining capacity of the storage plan is insufficient to offset the log backup storage usage, you are charged for the excess storage usage based on the pay-as-you-go billing method.
For more information about storage plans, see FAQ about billing for storage plans.
Reduce the volume of backup data and the backup fee
Shorten the retention period of backup data based on your business requirements. For more information, see Configure backup settings.
Shorten the retention period of level-1 backups, for example, from 7 days to 3 days.
Shorten the retention period of level-2 backups, for example, from 70 days to 30 days.
Shortening the retention period of level-1 and level-2 backups poses risks. If the backup set that you want to use to restore data exceeds the retention period, you cannot restore data by using the backup set.
Shorten the retention period of log backups, such as from 7 days to 3 days.
Shortening the retention period of log backups poses risks. If the log backup set that you want to use to restore data exceeds the retention period, you cannot restore data to the specific point in time.
Reduce the backup frequency (backup cycle) appropriately. For more information, see Configure backup settings.
Reduce the frequency of level-1 backup, for example, from once a day to three times a week.
Reducing the frequency of level-1 backup may increase the amount of time required to restore data to a point in time.
Reduce the frequency of level-2 backup, for example, from three times per week to twice per week.
You can purchase storage plans to offset the fees of level-1 backup, level-2 backup, and log backup. For more information, see Storage plans.
Delete backup sets that you no longer require from the recycle bin of your cluster to reduce the costs of level-2 backups. For more information, see Delete a backup.
