# Change History

Release Date | What's New
--- | ---
2022-08-19 | Updated the following content: Optimized some descriptions in this document.
2021-08-30 | Updated the following content: Deleted the parameters field and the table that describes the policy_param field from section "Updating a Backup Policy."
2021-07-21 | Updated the following content: Deleted the description of parameter app_consistency.
2020-03-06 | Updated the following content: Optimized the descriptions of parameters day_backups, week_backups, month_backups, and year_backups in section "Creating a Backup Policy."

2020-03-05

Updated the following content:

- Modified the example request in section "Creating a Backup Policy."
- Added the descriptions of parameters day_backups, week_backups, month_backups, and year_backups in section "Creating a Backup Policy."

2020-02-17

Updated the following content:

- Modified the description of parameter provider_id.
- Modified the description of parameter resource_id in section "Creating a Resource Backup."
- Modified the descriptions of parameters max_backups and retention_duration_days in section "Updating a Backup Policy."
- Modified the descriptions in section "Deleting a Backup."

2020-02-11

Updated the following content:

- Modified the table formats and table titles.
- Modified the parameter description and examples in section "Creating a Resource Backup."
- Modified the parameter description in section "Querying Backup Capabilities of Resources."
- Modified the parameter description in section "Querying Restoration Capabilities of Resources."
- Modified the parameter description in section "Creating a Backup Policy."
- Modified the parameter description in section "Updating a Backup Policy."
- Modified the examples in section "Querying Backup Resource Instances."

2019-02-12 | Updated the following content: Modified the description of the enabled parameter in section "Creating a Backup Policy."
2019-02-02 | Updated the following content: Changed the enabled parameter in section "Creating a Backup Policy" to mandatory and modified the parameter description.

2018-10-15

Updated the following content:

- Added the incremental parameter in section "Creating a Resource Backup".
- Removed content about BMS backups.
- Added the description of parameters max_backups, retention_duration_days, and permanent in sections "Creating a Backup Policy" and "Updating a Backup Policy".

2018-09-07 | Accepted in OTC-3.2.
2018-08-15 | Updated the following content: Modified the description of the pattern parameter.
2018-07-30 | Updated the following content: Added fields related to BMS backup.

2018-06-26

Updated the following content:

- Added description of image-related fields.
- Modified the naming rules for tag keys and tag values.
- Accepted in OTC 3.1.

2018-05-03 | Updated the following content: Deleted the former sections 1 API Calling and 2 Common Message Headers, and added section 1 API Usage Guidelines.
2018-03-30 | Updated the following content: Added APIs related to tag management.

2018-01-23

Updated the following content:

- Some ease-of-use issues are resolved.
- Added the support for specifying the backup interval in units of days.

2017-09-08 | Updated the following content: Some ease-of-use issues are resolved.
2017-07-30 | This issue is the first official release.