PolarDB allows you to use the backup and restoration features free of charge. However, backup files consume some storage. This topic describes the pricing of PolarDB data backups.

Free quota

PolarDB offers a free quota of storage to store backup files. When you use the backup feature of PolarDB and the used storage exceeds the free quota, you are charged based on the used storage and retention period of backup files. The backup files include data backups and log backups.

For more information, see Back up data.

Backup type Free quota
Data backup Level-1 backup Used database storage × 50%

For more information about how to view the used database storage, see View the database storage usage.

Level-2 backup None
Log backup 100 GB

Pricing of data backups that exceed the free quota

  • Pay-as-you-go

    If the storage used by backups exceeds the free quota, you are charged for the excess storage based on the usage and retention period on a pay-as-you-go basis.

    Backup type Unit price (USD/GB/hour) Calculation method of hourly storage fee
    Mainland China China (Hong Kong) and regions outside China
    Level-1 backup

    0.000464

    0.000650

    Storage fee per hour = (Total physical storage of level-1 backups - Free quota) × Unit price per hour

    For example, if the total physical storage of level-1 backups is 700 GB and the used database storage is 1,000 GB, the storage fee per hour is USD 0.0928.

    The fee is calculated based on the following formula: [700 GB - (1,000 GB × 50%)] × USD 0.000464/GB/hour = USD 0.0928/hour.

    Note For more information, see FAQ about the backup feature.
    Level-2 backup

    0.0000325

    0.0000455

    Storage fee per hour = Total physical storage of level-2 backups × Unit price per hour

    For example, if the total physical storage of level-2 backups is 1,000 GB, the storage fee per hour is USD 0.0325.

    The fee is calculated based on the following formula: 1,000 GB × USD 0.0000325/GB/hour = USD 0.0325/hour.

    Log backup

    0.0000325

    0.0000455

    Storage fee per hour = (Total physical storage of log backups - 100 GB) × Unit price per hour

    For example, if the total physical storage of log backups is 1,000 GB, the storage fee per hour is USD 0.02925.

    The fee is calculated based on the following formula: (1,000 GB - 100 GB) × USD 0.0000325/GB/hour = USD 0.02925/hour.

  • Storage plans

    Storage that exceeds the free quota is charged on a pay-as-you-go basis. To offset the fees of level-1 backups, we recommend that you use storage plans. This is more cost-effective.

    You can use a purchased storage plan to offset the used storage of all PolarDB clusters within your account. The remaining capacity of the storage plan is automatically used to offset the storage that exceeds the free quota for level-1 backups at a ratio of 1:1.6 until the storage plan is exhausted. In this case, every 1 GB of the storage plan can offset 1.6 GB of level-1 backup storage.

    If the remaining capacity of the storage plan is insufficient to offset the storage of level-1 backups, the excess storage is charged on a pay-as-you-go basis. For more information about how to use storage plans to offset fees, see Storage plans.