Database Backup (DBS) allows you to back up your databases in a continuous and cost-effective manner. DBS provides a variety of backup schedule specifications, including micro, small, medium, large, and xlarge. More advanced backup schedule specifications offer lower unit prices and higher performance.This topic describes how to select a backup schedule specification.
Fees for backup schedule specifications
The free quota for data backup, unit price, and backup data and restoration performance vary with backup schedule specifications.
The following formula is used to calculate the fees for a backup schedule specification: Configuration fees + (Actual backup data size - Free quota for data backup) × Unit price of the backup schedule specification.
- Fees for micro: CNY 30 + (600 GB - 40 GB) × CNY 0.75/GB = CNY 450
- Fees for small: CNY 140 + (600 GB - 400 GB) × CNY 0.35/GB = CNY 210
- Fees for medium are CNY 224. The actual backup data size is smaller than the free quota. No additional fees are incurred.
Performance of backup schedule specifications
- The following table describes the backup performance of backup schedule specifications.
Specification Estimated time taken to back up 100 GB of data micro 20 hours small 5 hours medium 2.5 hours large 1.5 hours xlarge 1 hour
- For more information about restoration performance, see Backup and restoration performance tests.
Database backup scenarios involve the following concepts: database disk space, data file size, backup data size, and storage data size.
|Database disk space||The total disk space of a database consists of the total space consumed by data files,
logs, and operating system files as well as the available space of the operating system
of the server where the database resides.
|Data file size||The data file size of a database is equal to the amount of disk space occupied by
database data files on the server where the database resides.
You can perform the following operations to view the data file size of a database:
|Backup data size||The backup data size of a database refers to the amount of data that you back up by using DBS. This size depends on a variety of factors such as the database type, backup mode, and backup granularity.|
|Storage data size||The storage data size of a database refers to the amount of data stored in the storage system. This size depends on a variety of factors such as the backup data size, the storage format of backup data, and the compression algorithm.|
The following space sizes are in descending order: database disk space > data file size > backup data size > storage data size.