# Change History

Release Date | Description
--- | ---
2021-12-02 | Updated the following content: Optimized some procedures and descriptions.
2019-10-21 | Updated the following content: Added the description of parameters for daily, weekly, monthly, and yearly backup in the section "Creating a Backup Policy."
2019-02-03 | Updated the following content: Accepted in OTC-4.0/Agile-01.2019.

2019-01-25

Updated the following content:

- Modified description of backing up ECSs with shared EVSs in sections 3.2.1 "Creating a Backup Policy" and 3.2.7 "Associating ECSs with a Backup Policy."
- Deleted incorrect description in section 4.1.1 "What Is CSBS?"

2018-12-17 | Updated the following content: Added the description of support for backing up servers with shared disks.

2018-09-27

Updated the following content:

- Added the description of Instant Restore.
- Added the description about how to create a full backup when creating a backup.
- Removed content about BMS backups.
- Removed content about the support for shared disk backup.
- Added some troubleshooting cases.
- Added some FAQs and classified the FAQs.

2018-08-20 | Modified the following content: Accepted in OTC 3.2.

2018-08-02

Updated the following content:

- Added descriptions of BMSs.
- Added descriptions of hour-level execution time configuration.

2018-07-31 | Accepted in OTC-3.1/Agile-07.2018.
2018-07-17 | Updated the following content: Modified the function description.

2018-07-05

Updated the following content:

- Modified the function description.
- Modified the description of backup states that support image creation in the prerequisites.

2018-06-13 | Updated the following content: Added the feature for creating images.

2018-06-08

Updated the following content:

- Deleted descriptions of hour-level execution time configuration.
- Modified the naming rules for tag keys and tag values.

2018-05-23 | Accepted in OTC 3.1.

2018-05-03

Updated the following content:

- Restructure section 3.1.2 Using Backups to Restore ECSs to section 3.3.
- Restructure section 3.1.3 Deleting a Backup to section 3.1.2.
- Restructure section 3.1.4 Managing Backup Tags to section 3.1.3.

2018-04-28 | Updated the following content: Modified the input rules of tag keys and tag values.

2018-03-30

Updated the following content:

- Added description of tag management.
- Added the time limit on backup intervals.
- Added the feature for querying backup space information.

2018-01-23

Updated the following content:

- Updated the document based on the new console layout.
- Added descriptions of the relationship between CSBS and VBS.
- Added some FAQs.

2017-11-01 | Updated the following content: Modified the overview of CSBS.
2017-09-30 | Updated the following content: Updated the document based on changes in the GUI information.
2017-09-08 | Updated the following content: Updated the document based on changes in the GUI information.
2017-08-31 | Updated the following content: Updated the document based on changes in the GUI information.
2017-08-04 | Updated the following content: Refined some language expressions.
2017-07-30 | This issue is the first official release.