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        "title": "Account for full start windows when AWS Backup rules overlap",
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        "potentially_affected": "This concerns backup-plan scheduling and overlap optimization. A chosen schedule does not establish a guaranteed backup completion time or an application recovery objective.",
        "dse_recommendation": "DSE recommends drawing the daily start windows for every effective rule on one timeline.",
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        "content_html": "<p>A longer-retention backup rule can suppress expected shorter-retention jobs across its entire start window.</p>\n<h2>Source facts</h2>\n<p>When AWS Backup rule start windows overlap, AWS Backup retains the backup under the longer-retention rule. Its optimization considers the full start window rather than only the nominal scheduled time. A job can remain CREATED while waiting to start and can become EXPIRED when its start window runs out. Snapshot scheduling and continuous point-in-time protection have different behavior.</p>\n<p>Source: <a href=\"https://docs.aws.amazon.com/aws-backup/latest/devguide/plan-options-and-configuration.html\">AWS — Backup plan options and configuration</a>.</p>\n<h2>Applicability</h2>\n<p>This concerns backup-plan scheduling and overlap optimization. A chosen schedule does not establish a guaranteed backup completion time or an application recovery objective.</p>\n<h2>DSE recommendation</h2>\n<p>DSE recommends drawing the daily start windows for every effective rule on one timeline. Calculate the recovery-point pattern produced by overlapping windows before interpreting fewer jobs as a failure. Separate start deadlines from completion deadlines in monitoring. Ask the application owner to approve the resulting gap between usable recovery points, and review maintenance-window conflicts before reducing a start window to force a desired count. Give the recovery owner a simple timeline showing the resulting usable points, not only the configured rule names. Review that timeline whenever another rule is added so a well-intended retention change does not leave an unexplained monitoring expectation.</p>\n<h2>Verification</h2>\n<p>Proposed verification: observe a full approved test schedule and compare actual job start times, expiry states and retained recovery points with the planned timeline. Check the longest gap between usable backups. Keep failed-start alerts separate from intentionally optimized overlapping rules so operators can investigate the right condition.</p>\n<h2>Official reference</h2>\n<p><a href=\"https://docs.aws.amazon.com/aws-backup/latest/devguide/plan-options-and-configuration.html\">AWS — Backup plan options and configuration</a>. Reviewed October 20, 2026.</p>",
        "content_text": "A longer-retention backup rule can suppress expected shorter-retention jobs across its entire start window.\nSource facts\nWhen AWS Backup rule start windows overlap, AWS Backup retains the backup under the longer-retention rule. Its optimization considers the full start window rather than only the nominal scheduled time. A job can remain CREATED while waiting to start and can become EXPIRED when its start window runs out. Snapshot scheduling and continuous point-in-time protection have different behavior.\nSource: AWS — Backup plan options and configuration.\nApplicability\nThis concerns backup-plan scheduling and overlap optimization. A chosen schedule does not establish a guaranteed backup completion time or an application recovery objective.\nDSE recommendation\nDSE recommends drawing the daily start windows for every effective rule on one timeline. Calculate the recovery-point pattern produced by overlapping windows before interpreting fewer jobs as a failure. Separate start deadlines from completion deadlines in monitoring. Ask the application owner to approve the resulting gap between usable recovery points, and review maintenance-window conflicts before reducing a start window to force a desired count. Give the recovery owner a simple timeline showing the resulting usable points, not only the configured rule names. Review that timeline whenever another rule is added so a well-intended retention change does not leave an unexplained monitoring expectation.\nVerification\nProposed verification: observe a full approved test schedule and compare actual job start times, expiry states and retained recovery points with the planned timeline. Check the longest gap between usable backups. Keep failed-start alerts separate from intentionally optimized overlapping rules so operators can investigate the right condition.\nOfficial reference\nAWS — Backup plan options and configuration. Reviewed October 20, 2026.",
        "content_markdown": "A longer-retention backup rule can suppress expected shorter-retention jobs across its entire start window.\n\n## Source facts\n\nWhen AWS Backup rule start windows overlap, AWS Backup retains the backup under the longer-retention rule. Its optimization considers the full start window rather than only the nominal scheduled time. A job can remain CREATED while waiting to start and can become EXPIRED when its start window runs out. Snapshot scheduling and continuous point-in-time protection have different behavior.\n\nSource: [AWS — Backup plan options and configuration](https://docs.aws.amazon.com/aws-backup/latest/devguide/plan-options-and-configuration.html).\n\n## Applicability\n\nThis concerns backup-plan scheduling and overlap optimization. A chosen schedule does not establish a guaranteed backup completion time or an application recovery objective.\n\n## DSE recommendation\n\nDSE recommends drawing the daily start windows for every effective rule on one timeline. Calculate the recovery-point pattern produced by overlapping windows before interpreting fewer jobs as a failure. Separate start deadlines from completion deadlines in monitoring. Ask the application owner to approve the resulting gap between usable recovery points, and review maintenance-window conflicts before reducing a start window to force a desired count. Give the recovery owner a simple timeline showing the resulting usable points, not only the configured rule names. Review that timeline whenever another rule is added so a well-intended retention change does not leave an unexplained monitoring expectation.\n\n## Verification\n\nProposed verification: observe a full approved test schedule and compare actual job start times, expiry states and retained recovery points with the planned timeline. Check the longest gap between usable backups. Keep failed-start alerts separate from intentionally optimized overlapping rules so operators can investigate the right condition.\n\n## Official reference\n\n[AWS — Backup plan options and configuration](https://docs.aws.amazon.com/aws-backup/latest/devguide/plan-options-and-configuration.html). Reviewed October 20, 2026."
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