cloud: update backup policies and execution rules

[wildpcww]

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What is changed, added or deleted? (Required)

Modified autobackup behavior to reflect the new tier design.

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[gemini-code-assist]

Summary of Changes

Hello @wildpcww, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request updates the documentation for TiDB Cloud, primarily focusing on the automatic backup behavior and high availability configurations for the Premium tier. The changes reflect a new tier design for backups, providing more detailed information on backup policies and introducing the ability to restore from external cloud storage. Additionally, the documentation now clearly states the default and non-configurable regional high availability setting for Premium instances.

Highlights

• Enhanced Premium Backup Documentation: The automatic backup section for TiDB Cloud Premium has been significantly revised to detail new policies, including Point-in-Time Recovery (PITR), hourly, and daily snapshots with specific retention periods.
• New Cloud Storage Restore Option: Documentation for Premium instances now includes a new feature allowing restoration of backups directly from cloud storage (Amazon S3 and Alibaba Cloud OSS).
• High Availability Configuration Clarification: Updates clarify that TiDB Cloud Premium instances exclusively use regional high availability, which is non-configurable, and this information is now consistently reflected across relevant documentation.

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[gemini-code-assist]

Code Review

This pull request updates the documentation to reflect new backup and high availability designs, primarily for the Premium tier. The changes are generally clear and align with the new features. My review includes suggestions to fix typos in custom markdown tags, improve phrasing for consistency with the style guide, and reduce repetition for better maintainability. Overall, the updates are good, and my feedback aims to polish the content further.

[ti-chi-bot]

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