diff --git a/src/features/hardening/LegacyProtocolsPage.tsx b/src/features/hardening/LegacyProtocolsPage.tsx
index 28fb015..e0ddc68 100644
--- a/src/features/hardening/LegacyProtocolsPage.tsx
+++ b/src/features/hardening/LegacyProtocolsPage.tsx
@@ -40,6 +40,7 @@ import {
   type SwitchUpdate,
 } from './protocolPolicy';
 import { ConfirmTurnOff, ImpactPanel, ProtocolSwitch, Statement } from './parts';
+import { LogRetentionCard } from './LogRetentionCard';
 
 type Load = { kind: 'loading' } | { kind: 'ready'; policy: ProtocolPolicy } | { kind: 'error'; message: string };
 
@@ -195,6 +196,8 @@ export function LegacyProtocolsPage() {
           }}
         />
       )}
+
+      <LogRetentionCard />
     </div>
   );
 }
diff --git a/src/features/hardening/LogRetentionCard.tsx b/src/features/hardening/LogRetentionCard.tsx
new file mode 100644
index 0000000..858e6a9
--- /dev/null
+++ b/src/features/hardening/LogRetentionCard.tsx
@@ -0,0 +1,122 @@
+/*
+ * SPDX-FileCopyrightText: 2026 Coffey Labs
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+/**
+ * INBUXA: how long rotated log files are kept (personal-data catalog spec,
+ * D1), on Settings › Security › Hardening. Log files carry client IP
+ * addresses and email addresses; without a limit they are never deleted.
+ */
+
+import { useEffect, useState } from 'react';
+import { useTranslation } from 'react-i18next';
+import { FileClock, Loader2 } from 'lucide-react';
+import { Button } from '@/components/ui/button';
+import { Input } from '@/components/ui/input';
+import { useAccountStore } from '@/stores/accountStore';
+import { toast } from '@/hooks/use-toast';
+import { fetchLogSettings, updateLogSettings, validDays, type KeepForDays } from './logSettings';
+
+export function LogRetentionCard() {
+  const { t } = useTranslation();
+  const canGet = useAccountStore((s) => s.hasPermission('sysTracerGet'));
+  const canUpdate = useAccountStore((s) => s.hasPermission('sysTracerUpdate'));
+  const [keep, setKeep] = useState<KeepForDays | undefined>(undefined);
+  const [editing, setEditing] = useState(false);
+  const [value, setValue] = useState('30');
+  const [busy, setBusy] = useState(false);
+
+  useEffect(() => {
+    if (!canGet) return;
+    const controller = new AbortController();
+    fetchLogSettings(controller.signal)
+      .then((days) => !controller.signal.aborted && setKeep(days))
+      // An older server has no such setting: show nothing
+      .catch(() => {});
+    return () => controller.abort();
+  }, [canGet]);
+
+  if (keep === undefined) return null;
+
+  const save = async (days: KeepForDays) => {
+    setBusy(true);
+    try {
+      await updateLogSettings(days);
+      setKeep(days);
+      setEditing(false);
+    } catch (e) {
+      toast({
+        variant: 'destructive',
+        title: t('logRetention.failed', 'Not saved'),
+        description: e instanceof Error ? e.message : String(e),
+      });
+    } finally {
+      setBusy(false);
+    }
+  };
+
+  return (
+    <section className="space-y-3 rounded-xl border p-4">
+      <div className="flex items-start gap-3">
+        <FileClock className="mt-0.5 h-5 w-5 shrink-0 text-muted-foreground" />
+        <div className="space-y-1">
+          <p className="font-medium">{t('logRetention.title', 'Log files')}</p>
+          <p className="text-sm text-muted-foreground">
+            {keep === null
+              ? t(
+                  'logRetention.forever',
+                  'Rotated log files are kept with no limit. They record client IP addresses and email addresses.',
+                )
+              : t('logRetention.days', {
+                  count: keep,
+                  defaultValue_one: 'Rotated log files are deleted after 1 day, on every server.',
+                  defaultValue_other: 'Rotated log files are deleted after {{count}} days, on every server.',
+                })}
+          </p>
+        </div>
+      </div>
+      {canUpdate && !editing && (
+        <div className="flex flex-wrap gap-2">
+          <Button
+            variant="outline"
+            size="sm"
+            onClick={() => {
+              setValue(String(keep ?? 30));
+              setEditing(true);
+            }}
+          >
+            {t('logRetention.change', 'Change…')}
+          </Button>
+          {keep !== null && (
+            <Button variant="ghost" size="sm" disabled={busy} onClick={() => void save(null)}>
+              {t('logRetention.keepAll', 'Keep every file')}
+            </Button>
+          )}
+        </div>
+      )}
+      {canUpdate && editing && (
+        <form
+          className="flex flex-wrap items-end gap-2"
+          onSubmit={(e) => {
+            e.preventDefault();
+            if (validDays(value)) void save(Number(value));
+          }}
+        >
+          <label className="space-y-1 text-sm">
+            <span className="text-muted-foreground">{t('logRetention.daysLabel', 'Delete after (days)')}</span>
+            <Input type="number" min={1} value={value} onChange={(e) => setValue(e.target.value)} className="w-32" />
+          </label>
+          <Button type="submit" size="sm" disabled={busy || !validDays(value)}>
+            {busy && <Loader2 className="mr-2 h-4 w-4 animate-spin" />}
+            {t('logRetention.save', 'Save')}
+          </Button>
+          <Button type="button" variant="ghost" size="sm" disabled={busy} onClick={() => setEditing(false)}>
+            {t('common.cancel', 'Cancel')}
+          </Button>
+        </form>
+      )}
+    </section>
+  );
+}
diff --git a/src/features/hardening/logSettings.test.ts b/src/features/hardening/logSettings.test.ts
new file mode 100644
index 0000000..be95111
--- /dev/null
+++ b/src/features/hardening/logSettings.test.ts
@@ -0,0 +1,25 @@
+/*
+ * SPDX-FileCopyrightText: 2026 Coffey Labs
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import { describe, expect, it } from 'vitest';
+import { parseKeepForDays, validDays } from './logSettings';
+
+describe('log settings', () => {
+  it('reads null as keep every file', () => {
+    expect(parseKeepForDays({ keepForDays: null })).toBeNull();
+    expect(parseKeepForDays({})).toBeNull();
+    expect(parseKeepForDays({ keepForDays: 30 })).toBe(30);
+  });
+
+  it('takes whole days, at least one', () => {
+    expect(validDays('30')).toBe(true);
+    expect(validDays('1')).toBe(true);
+    expect(validDays('0')).toBe(false);
+    expect(validDays('1.5')).toBe(false);
+    expect(validDays('')).toBe(false);
+    expect(validDays('-3')).toBe(false);
+  });
+});
diff --git a/src/features/hardening/logSettings.ts b/src/features/hardening/logSettings.ts
new file mode 100644
index 0000000..902e202
--- /dev/null
+++ b/src/features/hardening/logSettings.ts
@@ -0,0 +1,58 @@
+/*
+ * SPDX-FileCopyrightText: 2026 Coffey Labs
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+/**
+ * INBUXA: `inbuxa:LogSettings`, how long rotated log files are kept
+ * (personal-data catalog spec, D1). `keepForDays` null keeps every file.
+ */
+
+import { getAccountId, jmapRequest } from '@/services/jmap/client';
+import type { JmapSetError } from '@/types/jmap';
+import { INBUXA_CAPABILITY, PolicyUnavailable } from './protocolPolicy';
+
+const OBJECT = 'inbuxa:LogSettings';
+
+/** Days kept, or null for every file. */
+export type KeepForDays = number | null;
+
+export function parseKeepForDays(raw: Record<string, unknown>): KeepForDays {
+  return typeof raw.keepForDays === 'number' ? raw.keepForDays : null;
+}
+
+export async function fetchLogSettings(signal?: AbortSignal): Promise<KeepForDays> {
+  const accountId = getAccountId('x:Tracer');
+  const responses = await jmapRequest([[`${OBJECT}/get`, { accountId, ids: null }, '0']], signal, [INBUXA_CAPABILITY]);
+  const [name, result] = responses[0] ?? [];
+  if (name !== `${OBJECT}/get`) {
+    const type = (result as { type?: string } | undefined)?.type;
+    if (type === 'unknownMethod' || type === 'unknownCapability') throw new PolicyUnavailable(type);
+    throw new Error((result as { description?: string } | undefined)?.description ?? type ?? 'Request failed');
+  }
+  const item = (result as { list?: Record<string, unknown>[] }).list?.[0];
+  if (!item) throw new PolicyUnavailable('notFound');
+  return parseKeepForDays(item);
+}
+
+export async function updateLogSettings(keepForDays: KeepForDays): Promise<void> {
+  const accountId = getAccountId('x:Tracer');
+  const responses = await jmapRequest(
+    [[`${OBJECT}/set`, { accountId, update: { singleton: { keepForDays } } }, '0']],
+    undefined,
+    [INBUXA_CAPABILITY],
+  );
+  const [name, result] = responses[0] ?? [];
+  if (name !== `${OBJECT}/set`) {
+    throw new Error((result as { description?: string } | undefined)?.description ?? 'Request failed');
+  }
+  const failed = (result as { notUpdated?: Record<string, JmapSetError> | null }).notUpdated?.singleton;
+  if (failed) throw new Error(failed.description ?? failed.type);
+}
+
+/** Whether a typed value is a whole number of days, at least one. */
+export function validDays(value: string): boolean {
+  const n = Number(value);
+  return value.trim() !== '' && Number.isInteger(n) && n >= 1;
+}