Volume Backup Service (VBS) is a backup service provided for the system disk and data disk of the cloud server. VBS allows you to back up your Elastic Volume Service (EVS) that stores important data, and restore your data from backups against EVS faults, accidental deletion of data, and hacker attacks, thus maximizing the security of your data.

Product Architecture

The VBS architecture is shown in the figure below:

Working Mechanism of VBS

VBS is performed mainly through full backups and incremental backups:

Full backup: Backs up all the data of the entire EVS at a certain time. Regardless of whether the data changes or not, a new backup copy will be created. By default, the system performs a full backup initially.
Incremental backup: Only backs up data changed since the last backup. After the initial backup, subsequent backups only record changes in the original data. This means that in addition to the initial backup, the system subsequently performs incremental backups by default, shortening the backup duration and saving backup space.

When a backup is deleted, only data blocks that are not dependent on other backups will be deleted, and other backup restoration data is not affected. When a full backup is deleted, the incremental backups will be merged, and the next backup nearest to the full backup becomes a new full backup. Both full and incremental backups can quickly and easily restore data to a given backup point.

When combined with object storage, VBS can store backup data to object storage to ensure the security of your backup data more economically and efficiently.

Volume Backup Service

Product Definition