diff --git a/messages/de.json b/messages/de.json
index f7ae333e9..593ca7c83 100644
--- a/messages/de.json
+++ b/messages/de.json
@@ -8177,7 +8177,6 @@
         "colSize": "Größe",
         "colCreatedAt": "Letzter Snapshot",
         "colActions": "Aktionen",
-        "retentionLabel": "Aufbewahrung: {days} Tage",
         "scheduleStaleTitle": "Die wöchentliche Sicherung läuft nicht mehr",
         "scheduleStaleDescription": "Die neueste geplante Kopie ist {days} Tage alt. Ein funktionierender wöchentlicher Lauf lässt keine älter als {threshold} Tage werden.",
         "scheduleFailedTitle": "Der letzte geplante Sicherungslauf ist fehlgeschlagen",
@@ -8330,7 +8329,9 @@
         "restoreSkippedVisitCiphertext": "Text zu Arztbesuch oder Praxis mit einem Schlüssel verschlüsselt, den dieser Server nicht hat (ohne ihn behalten)",
         "restoreSkippedVaccinationCiphertext": "Impf-Notiz mit einem Schlüssel verschlüsselt, den dieser Server nicht hat (Impfung ohne sie behalten)",
         "restoreSkippedEnvironmentLocationCiphertext": "Ort eines Umweltzeitraums oder -tags mit einem Schlüssel verschlüsselt, den dieser Server nicht hat (verschlüsselt behalten, diese Tage werden nicht neu abgerufen)",
-        "typePreWipe": "Vor dem Löschen aller Daten"
+        "typePreWipe": "Vor dem Löschen aller Daten",
+        "retentionNote": "Die wöchentliche Kopie wird jeden Sonntag ersetzt. Eine Kopie, die vor „Alle Daten löschen“ angelegt wurde, wird nach {days} Tagen gelöscht. Hochgeladene Kopien bleiben, bis ihr Konto gelöscht wird.",
+        "retentionNoteNoGrace": "Die wöchentliche Kopie wird jeden Sonntag ersetzt. Hochgeladene Kopien bleiben, bis ihr Konto gelöscht wird."
       },
       "danger-zone": {
         "title": "Gefahrenzone",
diff --git a/messages/en.json b/messages/en.json
index 4555be756..e9aaa311f 100644
--- a/messages/en.json
+++ b/messages/en.json
@@ -8177,7 +8177,6 @@
         "colSize": "Size",
         "colCreatedAt": "Last snapshot",
         "colActions": "Actions",
-        "retentionLabel": "Retention: {days} days",
         "scheduleStaleTitle": "The weekly backup has stopped",
         "scheduleStaleDescription": "The newest scheduled copy is {days} days old. A working weekly run never leaves one older than {threshold} days.",
         "scheduleFailedTitle": "The last scheduled backup run failed",
@@ -8330,7 +8329,9 @@
         "restoreSkippedVisitCiphertext": "Visit or practitioner text sealed with a key this server does not hold (kept without it)",
         "restoreSkippedVaccinationCiphertext": "Vaccination note sealed with a key this server does not hold (dose kept without it)",
         "restoreSkippedEnvironmentLocationCiphertext": "Location of an environment period or day sealed with a key this server does not hold (kept sealed, those days are not refreshed)",
-        "typePreWipe": "Before all data was deleted"
+        "typePreWipe": "Before all data was deleted",
+        "retentionNote": "The weekly copy is replaced every Sunday. A copy taken before \"Delete all data\" is deleted after {days} days. Uploaded copies stay until their account is erased.",
+        "retentionNoteNoGrace": "The weekly copy is replaced every Sunday. Uploaded copies stay until their account is erased."
       },
       "danger-zone": {
         "title": "Danger zone",
diff --git a/messages/es.json b/messages/es.json
index b3fb385fc..2901074ee 100644
--- a/messages/es.json
+++ b/messages/es.json
@@ -8177,7 +8177,6 @@
         "colSize": "Tamaño",
         "colCreatedAt": "Última instantánea",
         "colActions": "Acciones",
-        "retentionLabel": "Conservación: {days} días",
         "scheduleStaleTitle": "La copia de seguridad semanal se ha detenido",
         "scheduleStaleDescription": "La copia programada más reciente tiene {days} días. Una ejecución semanal que funciona nunca deja ninguna con más de {threshold} días.",
         "scheduleFailedTitle": "La última ejecución programada de la copia de seguridad falló",
@@ -8330,7 +8329,9 @@
         "restoreSkippedVisitCiphertext": "Texto de visita o profesional cifrado con una clave que este servidor no tiene (se conserva sin él)",
         "restoreSkippedVaccinationCiphertext": "Nota de vacunación cifrada con una clave que este servidor no tiene (la dosis se conserva sin ella)",
         "restoreSkippedEnvironmentLocationCiphertext": "Ubicación de un periodo o día ambiental cifrada con una clave que este servidor no tiene (se conserva cifrada, esos días no se actualizan)",
-        "typePreWipe": "Antes de eliminar todos los datos"
+        "typePreWipe": "Antes de eliminar todos los datos",
+        "retentionNote": "La copia semanal se reemplaza cada domingo. Una copia tomada antes de «Eliminar todos los datos» se elimina al cabo de {days} días. Las copias subidas se quedan hasta que se borra su cuenta.",
+        "retentionNoteNoGrace": "La copia semanal se reemplaza cada domingo. Las copias subidas se quedan hasta que se borra su cuenta."
       },
       "danger-zone": {
         "title": "Zona de peligro",
diff --git a/messages/fr.json b/messages/fr.json
index c01ea578a..6fbdaa48e 100644
--- a/messages/fr.json
+++ b/messages/fr.json
@@ -8177,7 +8177,6 @@
         "colSize": "Taille",
         "colCreatedAt": "Dernier instantané",
         "colActions": "Actions",
-        "retentionLabel": "Conservation : {days} jours",
         "scheduleStaleTitle": "La sauvegarde hebdomadaire s'est arrêtée",
         "scheduleStaleDescription": "La copie planifiée la plus récente date de {days} jours. Une exécution hebdomadaire qui fonctionne n'en laisse jamais une dépasser {threshold} jours.",
         "scheduleFailedTitle": "La dernière exécution planifiée de la sauvegarde a échoué",
@@ -8330,7 +8329,9 @@
         "restoreSkippedVisitCiphertext": "Texte de consultation ou de praticien chiffré avec une clé que ce serveur ne possède pas (conservé sans)",
         "restoreSkippedVaccinationCiphertext": "Note de vaccination chiffrée avec une clé que ce serveur ne possède pas (dose conservée sans)",
         "restoreSkippedEnvironmentLocationCiphertext": "Lieu d'une période ou d'un jour environnemental chiffré avec une clé que ce serveur ne possède pas (conservé chiffré, ces jours ne sont pas actualisés)",
-        "typePreWipe": "Avant la suppression de toutes les données"
+        "typePreWipe": "Avant la suppression de toutes les données",
+        "retentionNote": "La copie hebdomadaire est remplacée chaque dimanche. Une copie prise avant « Supprimer toutes les données » est supprimée au bout de {days} jours. Les copies téléversées restent jusqu’à l’effacement de leur compte.",
+        "retentionNoteNoGrace": "La copie hebdomadaire est remplacée chaque dimanche. Les copies téléversées restent jusqu’à l’effacement de leur compte."
       },
       "danger-zone": {
         "title": "Zone de danger",
diff --git a/messages/it.json b/messages/it.json
index 99fcdeec7..798c1b79a 100644
--- a/messages/it.json
+++ b/messages/it.json
@@ -8177,7 +8177,6 @@
         "colSize": "Dimensione",
         "colCreatedAt": "Ultima istantanea",
         "colActions": "Azioni",
-        "retentionLabel": "Conservazione: {days} giorni",
         "scheduleStaleTitle": "Il backup settimanale si è fermato",
         "scheduleStaleDescription": "La copia pianificata più recente ha {days} giorni. Un'esecuzione settimanale funzionante non ne lascia mai una più vecchia di {threshold} giorni.",
         "scheduleFailedTitle": "L'ultima esecuzione pianificata del backup non è riuscita",
@@ -8330,7 +8329,9 @@
         "restoreSkippedVisitCiphertext": "Testo di visita o professionista cifrato con una chiave che questo server non possiede (mantenuto senza)",
         "restoreSkippedVaccinationCiphertext": "Nota di vaccinazione cifrata con una chiave che questo server non possiede (dose mantenuta senza)",
         "restoreSkippedEnvironmentLocationCiphertext": "Luogo di un periodo o giorno ambientale cifrato con una chiave che questo server non possiede (mantenuto cifrato, quei giorni non vengono aggiornati)",
-        "typePreWipe": "Prima dell’eliminazione di tutti i dati"
+        "typePreWipe": "Prima dell’eliminazione di tutti i dati",
+        "retentionNote": "La copia settimanale viene sostituita ogni domenica. Una copia presa prima di «Elimina tutti i dati» viene eliminata dopo {days} giorni. Le copie caricate restano finché il loro account non viene cancellato.",
+        "retentionNoteNoGrace": "La copia settimanale viene sostituita ogni domenica. Le copie caricate restano finché il loro account non viene cancellato."
       },
       "danger-zone": {
         "title": "Zona pericolosa",
diff --git a/messages/ko.json b/messages/ko.json
index 59c9c62b9..6e38b7d5b 100644
--- a/messages/ko.json
+++ b/messages/ko.json
@@ -8152,7 +8152,6 @@
         "colSize": "크기",
         "colCreatedAt": "최근 스냅샷",
         "colActions": "동작",
-        "retentionLabel": "보관 기간: {days}일",
         "scheduleStaleTitle": "주간 백업이 중단되었습니다",
         "scheduleStaleDescription": "가장 최근의 예약 사본이 {days}일 전 것입니다. 정상적으로 도는 주간 실행은 {threshold}일보다 오래된 사본을 남기지 않습니다.",
         "scheduleFailedTitle": "마지막 예약 백업 실행이 실패했습니다",
@@ -8305,7 +8304,9 @@
         "restoreSkippedVisitCiphertext": "이 서버에 없는 키로 암호화된 진료 또는 의료진 텍스트(해당 내용 없이 유지됨)",
         "restoreSkippedVaccinationCiphertext": "이 서버에 없는 키로 암호화된 예방접종 메모(접종 기록은 메모 없이 유지됨)",
         "restoreSkippedEnvironmentLocationCiphertext": "이 서버에 없는 키로 암호화된 환경 기간 또는 날짜의 위치(암호화된 채 유지되며 해당 날짜는 새로 가져오지 않음)",
-        "typePreWipe": "모든 데이터 삭제 전"
+        "typePreWipe": "모든 데이터 삭제 전",
+        "retentionNote": "주간 사본은 매주 일요일에 교체돼요. \"모든 데이터 삭제\" 전에 만든 사본은 {days}일 뒤에 삭제돼요. 올린 사본은 해당 계정이 지워질 때까지 남아요.",
+        "retentionNoteNoGrace": "주간 사본은 매주 일요일에 교체돼요. 올린 사본은 해당 계정이 지워질 때까지 남아요."
       },
       "danger-zone": {
         "title": "위험 구역",
diff --git a/messages/nl.json b/messages/nl.json
index be0f707df..7152c3151 100644
--- a/messages/nl.json
+++ b/messages/nl.json
@@ -8177,7 +8177,6 @@
         "colSize": "Grootte",
         "colCreatedAt": "Laatste snapshot",
         "colActions": "Acties",
-        "retentionLabel": "Bewaartermijn: {days} dagen",
         "scheduleStaleTitle": "De wekelijkse back-up is gestopt",
         "scheduleStaleDescription": "De nieuwste geplande kopie is {days} dagen oud. Een goed werkende wekelijkse run laat nooit een kopie ouder worden dan {threshold} dagen.",
         "scheduleFailedTitle": "De laatste geplande back-uprun is mislukt",
@@ -8330,7 +8329,9 @@
         "restoreSkippedVisitCiphertext": "Tekst van bezoek of zorgverlener versleuteld met een sleutel die deze server niet heeft (behouden zonder)",
         "restoreSkippedVaccinationCiphertext": "Vaccinatienotitie versleuteld met een sleutel die deze server niet heeft (dosis behouden zonder)",
         "restoreSkippedEnvironmentLocationCiphertext": "Locatie van een omgevingsperiode of -dag versleuteld met een sleutel die deze server niet heeft (versleuteld behouden, die dagen worden niet bijgewerkt)",
-        "typePreWipe": "Voor het verwijderen van alle gegevens"
+        "typePreWipe": "Voor het verwijderen van alle gegevens",
+        "retentionNote": "De wekelijkse kopie wordt elke zondag vervangen. Een kopie die vóór 'Alle gegevens verwijderen' is gemaakt, wordt na {days} dagen verwijderd. Geüploade kopieën blijven tot hun account gewist wordt.",
+        "retentionNoteNoGrace": "De wekelijkse kopie wordt elke zondag vervangen. Geüploade kopieën blijven tot hun account gewist wordt."
       },
       "danger-zone": {
         "title": "Gevarenzone",
diff --git a/messages/pl.json b/messages/pl.json
index 6998eca6c..39dd8dda7 100644
--- a/messages/pl.json
+++ b/messages/pl.json
@@ -8177,7 +8177,6 @@
         "colSize": "Rozmiar",
         "colCreatedAt": "Ostatnia migawka",
         "colActions": "Akcje",
-        "retentionLabel": "Przechowywanie: {days} dni",
         "scheduleStaleTitle": "Cotygodniowa kopia zapasowa przestała powstawać",
         "scheduleStaleDescription": "Najnowsza zaplanowana kopia ma {days} dni. Działające cotygodniowe uruchomienie nigdy nie zostawia kopii starszej niż {threshold} dni.",
         "scheduleFailedTitle": "Ostatnie zaplanowane uruchomienie kopii zapasowej nie powiodło się",
@@ -8330,7 +8329,9 @@
         "restoreSkippedVisitCiphertext": "Tekst wizyty lub lekarza zaszyfrowany kluczem, którego ten serwer nie ma (zachowany bez niego)",
         "restoreSkippedVaccinationCiphertext": "Notatka szczepienia zaszyfrowana kluczem, którego ten serwer nie ma (dawka zachowana bez niej)",
         "restoreSkippedEnvironmentLocationCiphertext": "Lokalizacja okresu lub dnia środowiskowego zaszyfrowana kluczem, którego ten serwer nie ma (zachowana w postaci zaszyfrowanej, te dni nie są odświeżane)",
-        "typePreWipe": "Przed usunięciem wszystkich danych"
+        "typePreWipe": "Przed usunięciem wszystkich danych",
+        "retentionNote": "Cotygodniowa kopia jest zastępowana w każdą niedzielę. Kopia wykonana przed „Usuń wszystkie dane” jest usuwana po {days} dniach. Przesłane kopie zostają, dopóki ich konto nie zostanie usunięte.",
+        "retentionNoteNoGrace": "Cotygodniowa kopia jest zastępowana w każdą niedzielę. Przesłane kopie zostają, dopóki ich konto nie zostanie usunięte."
       },
       "danger-zone": {
         "title": "Strefa zagrożenia",
diff --git a/messages/pt-BR.json b/messages/pt-BR.json
index 8da4a4bdd..956b87db2 100644
--- a/messages/pt-BR.json
+++ b/messages/pt-BR.json
@@ -8177,7 +8177,6 @@
         "colSize": "Tamanho",
         "colCreatedAt": "Último instantâneo",
         "colActions": "Ações",
-        "retentionLabel": "Retenção: {days} dias",
         "scheduleStaleTitle": "O backup semanal parou",
         "scheduleStaleDescription": "A cópia agendada mais recente tem {days} dias. Uma execução semanal funcional nunca deixa uma com mais de {threshold} dias.",
         "scheduleFailedTitle": "A última execução agendada de backup falhou",
@@ -8330,7 +8329,9 @@
         "restoreSkippedVisitCiphertext": "Texto de consulta ou profissional selado com uma chave que este servidor não possui (mantido sem ele)",
         "restoreSkippedVaccinationCiphertext": "Nota de vacinação selada com uma chave que este servidor não possui (dose mantida sem ela)",
         "restoreSkippedEnvironmentLocationCiphertext": "Local de um período ou dia de ambiente selado com uma chave que este servidor não possui (mantido selado, esses dias não são atualizados)",
-        "typePreWipe": "Antes da exclusão de todos os dados"
+        "typePreWipe": "Antes da exclusão de todos os dados",
+        "retentionNote": "A cópia semanal é substituída todo domingo. Uma cópia feita antes de \"Excluir todos os dados\" é excluída depois de {days} dias. As cópias enviadas ficam até a conta delas ser apagada.",
+        "retentionNoteNoGrace": "A cópia semanal é substituída todo domingo. As cópias enviadas ficam até a conta delas ser apagada."
       },
       "danger-zone": {
         "title": "Zona de perigo",
diff --git a/src/app/api/admin/backups/__tests__/route.test.ts b/src/app/api/admin/backups/__tests__/route.test.ts
index 25c61fb3b..13f3e90ea 100644
--- a/src/app/api/admin/backups/__tests__/route.test.ts
+++ b/src/app/api/admin/backups/__tests__/route.test.ts
@@ -153,6 +153,16 @@ describe("GET /api/admin/backups — off-host freshness", () => {
     expect(byName.get("account-five")?.lastAttemptAt).toBeNull();
   });
 
+  it("states what ages a stored copy out, and invents no retention", async () => {
+    configuredMock.mockReturnValue(false);
+    findManyMock.mockResolvedValue([]);
+    vi.stubEnv("ACCOUNT_DELETION_GRACE_DAYS", "21");
+    const body = await read();
+    vi.unstubAllEnvs();
+    expect(body.preWipeCopyDays).toBe(21);
+    expect(body).not.toHaveProperty("retentionDays");
+  });
+
   it("says so when neither the environment nor the ledger knows of any upload", async () => {
     configuredMock.mockReturnValue(false);
     findManyMock.mockResolvedValue([
diff --git a/src/app/api/admin/backups/route.ts b/src/app/api/admin/backups/route.ts
index 38ec9db5b..69d441522 100644
--- a/src/app/api/admin/backups/route.ts
+++ b/src/app/api/admin/backups/route.ts
@@ -38,6 +38,7 @@ import {
 import { OFFHOST_BACKUP_QUEUE } from "@/lib/jobs/offhost-backup-queue";
 import { offhostPurgeDue } from "@/lib/jobs/offhost-purge-queue";
 import { ACTIVE_ACCOUNT } from "@/lib/account-deletion/active-account";
+import { accountDeletionGraceDays } from "@/lib/account-deletion/grace";
 import {
   classifyOffhostBackup,
   OFFHOST_BACKUP_PERIOD_HOURS,
@@ -213,9 +214,11 @@ export const GET = apiHandler(async () => {
 
   const payload: BackupsList = {
     rows: list,
-    // Matches the retention window the backup-prune job enforces so the
-    // backups page states the same number the worker acts on.
-    retentionDays: 90,
+    // What ages these copies out, and nothing more: no job prunes stored
+    // copies by age. The weekly copy is replaced in place, a pre-wipe copy
+    // is deleted by the account-deletion purge when its window ends, and an
+    // uploaded copy stays until its account is erased.
+    preWipeCopyDays: accountDeletionGraceDays(),
     schedule: summariseBackupSchedule({
       scheduledCreatedAt: rows
         .filter((row) => row.type === SCHEDULED_BACKUP_TYPE)
diff --git a/src/components/admin/__tests__/backups-restore-preview.test.tsx b/src/components/admin/__tests__/backups-restore-preview.test.tsx
index 4107fe523..4b7ba9444 100644
--- a/src/components/admin/__tests__/backups-restore-preview.test.tsx
+++ b/src/components/admin/__tests__/backups-restore-preview.test.tsx
@@ -49,7 +49,7 @@ vi.mock("@tanstack/react-query", () => ({
             createdAt: "2026-09-01T03:00:00.000Z",
           },
         ],
-        retentionDays: 30,
+        preWipeCopyDays: 14,
         schedule: {
           lastSuccessAt: "2026-09-01T03:00:00.000Z",
           lastSuccessAgeDays: 2,
diff --git a/src/components/admin/__tests__/backups-section-empty.test.tsx b/src/components/admin/__tests__/backups-section-empty.test.tsx
index b1d44b41d..2ae9f676e 100644
--- a/src/components/admin/__tests__/backups-section-empty.test.tsx
+++ b/src/components/admin/__tests__/backups-section-empty.test.tsx
@@ -19,7 +19,7 @@ const healthySchedule = {
 const mocks = vi.hoisted(() => ({
   // Mutable so one file can render both a healthy schedule and a broken one;
   // the query mock reads it on every render.
-  queryData: { rows: [], retentionDays: 30 } as Record<string, unknown>,
+  queryData: { rows: [], preWipeCopyDays: 14 } as Record<string, unknown>,
 }));
 
 /**
@@ -80,7 +80,7 @@ primeLocales("de");
 function render(locale: "en" | "de" = "en") {
   mocks.queryData = {
     rows: [],
-    retentionDays: 30,
+    preWipeCopyDays: 14,
     schedule: healthySchedule,
   };
   return renderToStaticMarkup(
@@ -159,7 +159,7 @@ describe("BackupsSection — empty state", () => {
  */
 describe("BackupsSection — schedule health", () => {
   function withSchedule(schedule: Record<string, unknown>) {
-    mocks.queryData = { rows: [], retentionDays: 30, schedule };
+    mocks.queryData = { rows: [], preWipeCopyDays: 14, schedule };
     return renderToStaticMarkup(
       <I18nProvider initialLocale="en">
         <BackupsSection />
@@ -203,7 +203,7 @@ describe("BackupsSection — schedule health", () => {
   });
 
   it("survives a response that predates the schedule field", () => {
-    mocks.queryData = { rows: [], retentionDays: 30 };
+    mocks.queryData = { rows: [], preWipeCopyDays: 14 };
     expect(() =>
       renderToStaticMarkup(
         <I18nProvider initialLocale="en">
diff --git a/src/components/admin/__tests__/offhost-backups-section.test.tsx b/src/components/admin/__tests__/offhost-backups-section.test.tsx
index 3631fe121..4a95cd637 100644
--- a/src/components/admin/__tests__/offhost-backups-section.test.tsx
+++ b/src/components/admin/__tests__/offhost-backups-section.test.tsx
@@ -36,7 +36,7 @@ function render(data: BackupsList["offhost"] | null): string {
         ? null
         : ({
             rows: [],
-            retentionDays: 90,
+            preWipeCopyDays: 14,
             schedule: null,
             offhost: data,
           } as unknown as BackupsList),
diff --git a/src/components/admin/backups-section.tsx b/src/components/admin/backups-section.tsx
index d8dcb62c2..514fd9034 100644
--- a/src/components/admin/backups-section.tsx
+++ b/src/components/admin/backups-section.tsx
@@ -197,9 +197,11 @@ export function BackupsSection() {
           <BackupRowsCards rows={rows} {...rowActions} />
 
           <p className="text-muted-foreground mt-2 text-xs">
-            {t("admin.section.backups.retentionLabel", {
-              days: data!.retentionDays,
-            })}
+            {data!.preWipeCopyDays > 0
+              ? t("admin.section.backups.retentionNote", {
+                  days: data!.preWipeCopyDays,
+                })
+              : t("admin.section.backups.retentionNoteNoGrace")}
           </p>
         </div>
       )}
diff --git a/src/lib/import/json/schema.ts b/src/lib/import/json/schema.ts
index e3f74c92f..d3e06acc0 100644
--- a/src/lib/import/json/schema.ts
+++ b/src/lib/import/json/schema.ts
@@ -37,7 +37,7 @@ import { SLEEP_STAGE_NAMES } from "@/lib/validations/sleep-stage-entry";
 import { fallbackMoodDateStart } from "./mood-instant";
 
 import { JSON_IMPORT_MAX_ROWS } from "./limits";
-export { JSON_IMPORT_MAX_BYTES, JSON_IMPORT_MAX_ROWS } from "./limits";
+export { JSON_IMPORT_MAX_BYTES } from "./limits";
 
 // The type is the canonical enum, so every type the exporters write comes
 // back; a hand-kept subset once dropped four of eleven.
diff --git a/src/types/backups.ts b/src/types/backups.ts
index f3c042999..7eacc4f06 100644
--- a/src/types/backups.ts
+++ b/src/types/backups.ts
@@ -102,11 +102,12 @@ export interface BackupsList {
    */
   offhost: OffhostBackupOverview;
   /**
-   * Soft retention hint — the worker is configured for weekly backups
-   * (see `DATA_BACKUP_CRON` in `src/lib/jobs/reminder-worker.ts`), and
-   * the model upserts in-place per (userId, type), so each user has
-   * exactly one current snapshot. The frontend uses this to label the
-   * grid; no server-side enforcement.
+   * How long a copy taken before "Delete all data" is kept: the deletion
+   * grace window, after which the account-deletion purge deletes it. 0 when
+   * there is no window and no such copy is taken. Nothing else ages a stored
+   * copy out: the weekly copy is replaced in place, one per account, and an
+   * uploaded copy stays until its account is erased. The page states exactly
+   * that.
    */
-  retentionDays: number;
+  preWipeCopyDays: number;
 }