Billing details
The backup and recovery features are free. However, backup files consume storage space. PolarDB charges fees for this storage based on the storage capacity and retention period of your data and log files. This topic describes the billing details for the backup and recovery features.
Standard Edition backup storage costs
Free quota
PolarDB Standard Edition provides a free quota for backup storage. If your backup storage usage exceeds the free quota, PolarDB charges fees for the excess usage based on the storage capacity and retention period of your data and log files.
Backup type | Free quota |
Data backup | 50% of database storage usage |
Log backup | 100 GB |
Billing rules
The Chinese mainland | Hong Kong (China) and other regions | Hourly cost calculation method |
CNY 0.00021/GB/hour | CNY 0.000294/GB/hour | Hourly cost = Total backup size × Hourly price For example, if the total backup size is 1000 GB, the hourly fee is CNY 0.21 in the Chinese mainland or . Formula: 1000 GB × CNY 0.00021/GB/hour = CNY 0.21/hour |
Use a storage plan to offset data backup costs
You can use a storage plan to offset data backup costs. If the capacity of the storage plan is not enough to offset the data backup storage usage, the excess usage is billed on a pay-as-you-go basis.
The deduction rules are as follows:
Region type | Deduction factor | Data backup storage offset by a 1 GB storage plan |
The Chinese mainland | 0.043 | 1/0.043 = 23.26 GB |
Hong Kong (China) and other regions | 0.054 | 1/0.054 = 18.52 GB |
For example, you purchase a 100 GB storage plan. After offsetting your primary storage usage, 50 GB remains. Your cluster in the Chinese mainland region uses 50 GB of data backup storage. The storage plan automatically uses 2.15 GB (50/23.26) of its capacity to offset this usage. The remaining capacity of the storage plan is 47.85 GB.
If the remaining capacity of the storage plan is not enough to offset the data backup storage usage, the excess usage is billed on a pay-as-you-go basis.
For more information about storage plan deductions, see Storage plan billing FAQ.
Use a storage plan to offset log backup costs
You can use a storage plan to offset log backup costs. If the capacity of the storage plan is not enough to offset the log backup storage usage, the excess usage is billed on a pay-as-you-go basis.
The deduction rules are as follows:
Region type | Deduction factor | Log backup storage offset by a 1 GB storage plan |
The Chinese mainland | 0.043 | 1/0.043 = 23.26 GB |
Hong Kong (China) and other regions | 0.054 | 1/0.054 = 18.52 GB |
For example, you purchase a 100 GB storage plan. After offsetting your primary storage usage, 50 GB remains. Your cluster in the Chinese mainland region uses 50 GB of log backup storage. The storage plan automatically uses 2.15 GB (50/23.26) of its capacity to offset this usage. The remaining capacity of the storage plan is 47.85 GB.
If the remaining capacity of the storage plan is not enough to offset the log backup storage usage, the excess usage is billed on a pay-as-you-go basis.
For more information about storage plan deductions, see Storage plan billing FAQ.
Enterprise Edition backup storage costs
Free quota
PolarDB provides a free quota for backup storage. If your backup storage usage exceeds the free quota, PolarDB charges for single-region backups based on the storage capacity and retention period of backup files (data and logs). For cross-region backups, PolarDB charges based on these same factors, plus the network traffic generated by the cross-region backup.
Backup type | Free quota | |
Data backup | Level-1 backup | 50% of database storage usage To learn how to view database storage usage, see View database storage usage. |
Level-2 backup | None | |
Log backup | 100 GB | |
Billing rules
Backup storage space is categorized into level-1 backup, level-2 backup, and log backup. The prices for each category are different:
Level-1 backup storage includes a free quota equal to 50% of the database storage usage. If this free quota is exceeded, PolarDB charges for the excess usage based on the storage capacity and retention period. The prices are as follows:
Storage class
The Chinese mainland
Hong Kong (China) and other regions
Hourly cost calculation method
PSL5
CNY 0.003/GB/hour
CNY 0.0042/GB/hour
Hourly cost = (Total size of level-1 backups - Free quota) × Hourly price
For example, for a PSL5 storage class in the Chinese mainland, if the total size of level-1 backups (snapshots) is 700 GB and the database storage usage is 1000 GB, the hourly cost is CNY 0.6.
Formula: (700 GB - (1000 GB × 50%)) × CNY 0.003/GB/hour = CNY 0.6/hour
NoteTo learn how to view the total size of level-1 backups (snapshots), see FAQ.
PSL4
CNY 0.002/GB/hour
CNY 0.0028/GB/hour
Level-2 backups support single-region and cross-region backup methods. For single-region backups, PolarDB charges on a pay-as-you-go basis for the storage capacity and retention period of backup files (data and logs). For cross-region backups, PolarDB charges on a pay-as-you-go basis for the storage capacity and retention period of backup files (data and logs), and for the network traffic that is generated by the cross-region backup.
Single-region backup billing rules
The Chinese mainland
Hong Kong (China) and other regions
Hourly cost calculation method
CNY 0.00021/GB/hour
CNY 0.000294/GB/hour
Hourly cost = Total size of level-2 backups × Hourly price
For example, if the total size of level-2 backups is 1000 GB in the Chinese mainland, the hourly cost is CNY 0.21.
Formula: 1000 GB × CNY 0.00021/GB/hour = CNY 0.21
Cross-region backup billing rules
Billable item
The Chinese mainland
Hong Kong (China) and other regions
Hourly cost calculation method
Backup storage
CNY 0.00021/GB/hour
CNY 0.000294/GB/hour
Hourly cost = Total size of level-2 backups × Hourly price + Cross-region network traffic cost
For example, for a cross-region backup between regions in the Chinese mainland, if the total size of level-2 backups is 1000 GB and the network traffic consumed by the cross-region backup dump is 500 MB, the hourly cost is CNY 0.4541.
Formula: 1000 GB × CNY 0.00021/GB/hour + 500 MB/1024 × CNY 0.5/GB = CNY 0.4541
Network traffic
For information about network traffic costs for cross-region backups, see Network costs.
NoteCross-region backups are billed daily. The prices in this document are converted to hourly rates.
The bills for cross-region backups are measured and displayed as Data Disaster Recovery bills.
Log backups support single-region and cross-region backup methods. For single-region backups, PolarDB charges on a pay-as-you-go basis for the storage capacity and retention period of backup files (data and logs). For cross-region backups, PolarDB charges on a pay-as-you-go basis for the storage capacity and retention period of backup files (data and logs), and for the network traffic that is generated by the cross-region backup.
Single-region backup billing rules
The Chinese mainland
Hong Kong (China) and other regions
Hourly cost calculation method
CNY 0.00021/GB/hour
CNY 0.000294/GB/hour
Hourly cost = (Total size of log backups - 100 GB) × Hourly price
For example, if the total size of log backups is 1000 GB in the Chinese mainland, the hourly cost is CNY 0.189.
Formula: (1000 GB - 100 GB) × CNY 0.00021/GB/hour = CNY 0.189/hour
Cross-region backup billing rules
Billable item
The Chinese mainland
Hong Kong (China) and other regions
Hourly cost calculation method
Backup storage
CNY 0.00021/GB/hour
CNY 0.000294/GB/hour
Hourly cost = (Total size of log backups - 100 GB) × Hourly price + Cross-region network traffic cost
For example, for a cross-region backup between regions in the Chinese mainland, if the total size of log backups is 1000 GB and the network traffic consumed by the cross-region backup dump is 500 MB, the hourly cost is CNY 0.4331.
Formula: (1000 GB - 100 GB) × CNY 0.00021/GB/hour + 500 MB/1024 × CNY 0.5/GB = CNY 0.4331
Network traffic
For information about network traffic costs for cross-region backups, see Network costs.
NoteCross-region backups are billed daily. The prices in this document are converted to hourly rates.
The bills for cross-region backups are measured and displayed as Data Disaster Recovery bills.
Storage plan deduction rules
Use a storage plan to offset level-1 backup costs
You can use a storage plan to offset the costs for level-1 backup usage that exceeds the free quota. If the capacity of the storage plan is not enough to offset the level-1 backup storage usage, the excess usage is billed on a pay-as-you-go basis.
The deduction rules are as follows:
Region type | Deduction factor | Level-1 backup storage offset by a 1 GB storage plan |
The Chinese mainland (PSL4) | 0.41 | 1/0.41 = 2.44 GB |
The Chinese mainland (PSL5) | 0.617 | 1/0.617 = 1.62 GB |
Hong Kong (China) and other regions (PSL4) | 0.41 | 1/0.41 = 2.44 GB |
Hong Kong (China) and other regions (PSL5) | 0.617 | 1/0.617 = 1.62 GB |
For example, you purchase a 100 GB storage plan. After offsetting your primary storage (PSL5) usage, 50 GB remains. Your cluster in the Chinese mainland region uses 50 GB of level-1 backup storage that exceeds the free quota. The storage plan automatically uses 31.25 GB (50/1.6) of its capacity to offset this usage. The remaining capacity of the storage plan is 18.75 GB.
If the remaining capacity of the storage plan is not enough to offset the level-1 backup storage usage, the excess usage is billed on a pay-as-you-go basis.
For more information about storage plan deductions, see Storage plan billing FAQ.
Use a storage plan to offset level-2 backup costs
You can use a storage plan to offset level-2 backup costs. If the capacity of the storage plan is not enough to offset the level-2 backup storage usage, the excess usage is billed on a pay-as-you-go basis.
The deduction rules are as follows:
Region type | Deduction factor | Level-2 backup storage offset by a 1 GB storage plan |
The Chinese mainland | 0.043 | 1/0.043 = 23.26 GB |
Hong Kong (China) and other regions | 0.054 | 1/0.054 = 18.52 GB |
For example, you purchase a 100 GB storage plan. After offsetting your primary storage usage, 50 GB remains. Your cluster in the Chinese mainland region uses 50 GB of level-2 backup storage. The storage plan automatically uses 2.15 GB (50/23.26) of its capacity to offset this usage. The remaining capacity of the storage plan is 47.85 GB.
If the remaining capacity of the storage plan is not enough to offset the level-2 backup storage usage, the excess usage is billed on a pay-as-you-go basis.
For more information about storage plan deductions, see Storage plan billing FAQ.
Use a storage plan to offset log backup costs
You can use a storage plan to offset log backup costs. If the capacity of the storage plan is not enough to offset the log backup storage usage, the excess usage is billed on a pay-as-you-go basis.
The deduction rules are as follows:
Region type | Deduction factor | Log backup storage offset by a 1 GB storage plan |
The Chinese mainland | 0.043 | 1/0.043 = 23.26 GB |
Hong Kong (China) and other regions | 0.054 | 1/0.054 = 18.52 GB |
For example, you purchase a 100 GB storage plan. After offsetting your primary storage usage, 50 GB remains. Your cluster in the Chinese mainland region uses 50 GB of log backup storage. The storage plan automatically uses 2.15 GB (50/23.26) of its capacity to offset this usage. The remaining capacity of the storage plan is 47.85 GB.
If the remaining capacity of the storage plan is not enough to offset the log backup storage usage, the excess usage is billed on a pay-as-you-go basis.
For more information about storage plan deductions, see Storage plan billing FAQ.
How to reduce backup data size and costs
You can reduce the retention period of backup data. For more information, see Configure a backup policy.
You can reduce the retention period of level-1 backups, for example, from 7 days to 3 days.
You can reduce the retention period of level-2 backups, for example, from 70 days to 30 days.
NoteReducing the retention period of level-1 and level-2 backups carries risks. If you try to restore a backup set that is older than the retention period, the restoration fails.
You can reduce the retention period of log backups, for example, from 7 days to 3 days.
NoteReducing the retention period of log backups carries risks. If you try to perform a point-in-time restore to a point in time that is earlier than the retention period, the restoration fails.
You can reduce the backup frequency (backup cycle). For more information, see Configure a backup policy.
You can reduce the frequency of level-1 backups, for example, from once a day to three times a week.
NoteReducing the frequency of level-1 backups may increase the time required to restore data to a point in time.
You can reduce the frequency of level-2 backups, for example, from three times a week to twice a week.
You can purchase a storage plan to offset the costs of level-1 backups, level-2 backups, and log backups. Using a storage plan is more cost-effective. For more information, see Storage plans.
You can delete unneeded backup sets from the cluster recycle bin to reduce level-2 backup costs. For more information, see Delete a backup set.