docs: clarify data region backup table

[ofeliacode]

What does this PR do?

Follow-up to #2844.

Clarifies the Cross-Region Backup table by labeling the secondary AWS regions with the same EU / US / JP mapping used for the
primary regions.

Also fixes Clickhouse -> ClickHouse casing in the Data Regions page.

Greptile Summary

This PR clarifies the Cross-Region Backup table in the Data Regions security page and fixes a casing typo.

• The secondary AWS region column now includes the same EU / US / HIPAA / JP geographic labels used in the primary region column, making the mapping between primary and secondary regions unambiguous.
• Clickhouse is corrected to ClickHouse in the opening paragraph.

Confidence Score: 5/5

This is a purely editorial documentation update with no code, logic, or configuration changes.

Both changes are accurate and self-consistent: secondary region labels mirror the primary region labels exactly (EU → eu-central-1, US / HIPAA → us-east-2, JP → ap-northeast-3), and the ClickHouse casing correction matches the product's official branding. Nothing about the underlying backup architecture or region assignments was altered.

No files require special attention.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    subgraph EU["EU Region"]
        EU_P["Postgres\neu-west-1"]
        EU_CH["ClickHouse\neu-west-1"]
        EU_S3["S3 Media\neu-west-1"]
    end

    subgraph US["US / HIPAA Region"]
        US_P["Postgres\nus-west-2"]
        US_CH["ClickHouse\nus-west-2"]
        US_S3["S3 Media\nus-west-2"]
    end

    subgraph JP["JP Region"]
        JP_P["Postgres\nap-northeast-1"]
        JP_CH["ClickHouse\nap-northeast-1"]
        JP_S3["S3 Media\nap-northeast-1"]
    end

    subgraph Secondary["Secondary Regions (Disaster Recovery)"]
        EU_SEC["EU: eu-central-1"]
        US_SEC["US / HIPAA: us-east-2"]
        JP_SEC["JP: ap-northeast-3"]
    end

    EU_P -- "AWS Backup daily snapshot copy\nre-encrypted with CMK\n7-day retention" --> EU_SEC
    US_P -- "AWS Backup daily snapshot copy\nre-encrypted with CMK\n7-day retention" --> US_SEC
    JP_P -- "AWS Backup daily snapshot copy\nre-encrypted with CMK\n7-day retention" --> JP_SEC

    EU_CH -. "Not replicated" .-> EU_SEC
    EU_S3 -. "Not replicated" .-> EU_SEC

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flowchart TD
    subgraph EU["EU Region"]
        EU_P["Postgres\neu-west-1"]
        EU_CH["ClickHouse\neu-west-1"]
        EU_S3["S3 Media\neu-west-1"]
    end

    subgraph US["US / HIPAA Region"]
        US_P["Postgres\nus-west-2"]
        US_CH["ClickHouse\nus-west-2"]
        US_S3["S3 Media\nus-west-2"]
    end

    subgraph JP["JP Region"]
        JP_P["Postgres\nap-northeast-1"]
        JP_CH["ClickHouse\nap-northeast-1"]
        JP_S3["S3 Media\nap-northeast-1"]
    end

    subgraph Secondary["Secondary Regions (Disaster Recovery)"]
        EU_SEC["EU: eu-central-1"]
        US_SEC["US / HIPAA: us-east-2"]
        JP_SEC["JP: ap-northeast-3"]
    end

    EU_P -- "AWS Backup daily snapshot copy\nre-encrypted with CMK\n7-day retention" --> EU_SEC
    US_P -- "AWS Backup daily snapshot copy\nre-encrypted with CMK\n7-day retention" --> US_SEC
    JP_P -- "AWS Backup daily snapshot copy\nre-encrypted with CMK\n7-day retention" --> JP_SEC

    EU_CH -. "Not replicated" .-> EU_SEC
    EU_S3 -. "Not replicated" .-> EU_SEC

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