The Apsara PolarDB backup and restore functions are available now, and you can use them for free. What's more, from 10:00 am (Beijing Time) on June 10, 2020, Apsara PolarDB will start charging for the storage space used by the backup files. For some backup methods, you can enjoy certain discounts.

Start time

Starting at 10:00 am on June 10, 2020 (Beijing Time), you will be charged for the storage space used by backup files in Apsara PolarDB.

Intended services

All Apsara PolarDB clusters.

Features

You can store backups for long-term use in Apsara PolarDB. You can also set the backup feature to retain backups of a cluster after you delete the cluster. This helps avoid data loss caused by user errors.

You can enable automatic backup of cluster and log data, or manually back up cluster data.

Backup types

Backup type Description
Level-1 backup (data backup)
  • Level-1 backups are stored on a distributed storage cluster. They are fast to create and restore. However, the storage costs are high.
  • The retention period of level-1 backups is from 7 to 14 days.
Level-2 backup (data backup)
  • Level-2 backups are compressed and stored in local storage. The storage costs of level-2 backups are lower than level-1 backups. However, it is time-consuming to restore level-2 backups.
  • Level-2 backups must be retained for at least 30 days.
  • By default, this feature is disabled. After you enable level-2 backup, expired level-1 backups are automatically archived to level-2 backups.
Log backup
  • Log data is saved in the Redo log of a database for point-in-time recovery (PITR).
  • Log backups must be retained for at least 7 days.

Billing methods

Backup type Free quota Billing method
Level-1 backup Database storage usage × 50%

To check the database storage usage, log on to the Apsara for PolarDB console, and click the cluster name to navigate to the Overview page.

Storage fee per hour = (The total physical storage of level-1 backups - Free quota) × Unit price per hour
  • You can use level-1 backups for free if the physical storage of the level-1 backups is less than 50% of database storage usage.
  • For more information about the unit price per hour, see Table 1.
  • Section 1 in the following figure displays the total physical storage of the level-1 backups. Section 2 displays the total logical storage of the level-1 backups.Total physical storage of level-1 backups

For example, if the total physical storage of the level-1 backups is 700 GB and database storage usage is 1,000 GB, the storage fee per hour is USD 0.6.

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

Level-2 backup None Storage fee per hour = The total physical storage of level-2 backups × Unit price per hour

For example: The total physical storage of level-2 backups is 1,000 GB. The storage fee per hour is USD 0.21.

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

Log backup 100 GB Storage fee per hour = (The total physical storage of log backups - 100 GB) × Unit price per hour

For example: The total physical storage of log backups is 1,000 GB. The storage fee per hour is USD 0.189.

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

Pricing

Table 1. Pricing
Region Level-1 backup Level-2 backup Log backup
Mainland China USD 0.000464/GB/hour USD 0.0000325/GB/hour USD 0.0000325/GB/hour
China (Hong Kong) and regions outside China USD 0.000650/GB/hour USD 0.0000455/GB/hour USD 0.0000455/GB/hour
Note The prices are provided for reference only. Pay close attention to the catalog prices released after Alibaba Cloud starts charging for backups.

FAQ

  • Does the total physical storage of level-1 backups equal the sum of all backups?
    The total physical storage of level-1 backups does not equal the sum of all backups. The total physical storage of level-1 backups is displayed in the ① section, as shown in the following figure.The total physical storage of level-1 backups
  • Why is the total physical storage of level-1 backups smaller than the size of a single backup?

    Level-1 backups in Apsara PolarDB are measured by using two methods: the physical storage of all backups and the logical storage of each backup. Apsara PolarDB uses snapshot chains to store level-1 backups. Each data block is replicated only once. Therefore, the physical storage of all level-1 backups is smaller than the total logical storage of all level-1 backups, or sometimes even smaller than the logical storage of a single backup.

  • How are backups in Apsara PolarDB backup billed?

    Storage fees are charged for level-1 backups, level-2 backups, and log backups. By default, level-1 backup and log backup are enabled, but level-2 backup is disabled. Alibaba Cloud also offers free storage for level-1 backups and log backups.

  • What is the billing method of level-1 backups?

    Storage fee per hour = (Total physical storage of level-1 backups - Database storage usage x 50%) x Unit price per hour. For example, the total physical storage of level-1 backups of an Apsara PolarDB cluster is 700 GB and the database storage usage is 1,000 GB. Then, the storage fee per hour is calculated as (700 GB - 500 GB) × USD 0.000464/GB = USD 0.0928.

  • Can I use a storage plan to deduct the storage fee?

    No, a storage plan can only be used to deduct storage fees incurred by the stored data. It is not applicable to backups.

Related topics

Back up data