diff --git a/.github/actions/build-extension/action.yml b/.github/actions/build-extension/action.yml
index c5368033..6cd68c9e 100644
--- a/.github/actions/build-extension/action.yml
+++ b/.github/actions/build-extension/action.yml
@@ -69,7 +69,7 @@ runs:
         else
           BASE="betterseqtaplus-${VERSION}"
         fi
-        (cd dist/chrome && zip -r "../${BASE}-chrome.zip" .)
-        (cd dist/firefox && zip -r "../${BASE}-firefox.zip" .)
+        tar -a -cf "dist/${BASE}-chrome.zip" -C dist/chrome .
+        tar -a -cf "dist/${BASE}-firefox.zip" -C dist/firefox .
         echo "chrome_zip=dist/${BASE}-chrome.zip" >> "$GITHUB_OUTPUT"
         echo "firefox_zip=dist/${BASE}-firefox.zip" >> "$GITHUB_OUTPUT"
diff --git a/.github/workflows/nightly.yml b/.github/workflows/nightly.yml
index 5974de2c..31e7769c 100644
--- a/.github/workflows/nightly.yml
+++ b/.github/workflows/nightly.yml
@@ -1,11 +1,18 @@
 # Nightly release workflow — updates the same "nightly" release with fresh builds from main.
 # Runs only on BetterSEQTA/BetterSEQTA-Plus. Uses the default GITHUB_TOKEN.
+#
+# Scheduled at midnight Australia/Adelaide (ACST/ACDT). GitHub cron is UTC-only, so we
+# trigger at 13:30 and 14:30 UTC and only proceed when Adelaide local time is 00:00.
+# Builds on windows-latest (matches local dev; Linux nightly builds were failing on Vite/Svelte).
 
 name: Nightly Release
 
 on:
   schedule:
-    - cron: "0 3 * * *"
+  # 13:30 UTC = 00:00 Adelaide during daylight saving (ACDT, UTC+10:30)
+    - cron: "30 13 * * *"
+  # 14:30 UTC = 00:00 Adelaide during standard time (ACST, UTC+9:30)
+    - cron: "30 14 * * *"
   workflow_dispatch:
 
 permissions:
@@ -16,16 +23,37 @@ env:
 
 jobs:
   nightly:
-    runs-on: ubuntu-latest
+    runs-on: windows-latest
+    defaults:
+      run:
+        shell: bash
     steps:
+      - name: Check Adelaide midnight
+        id: time_check
+        run: |
+          if [ "${{ github.event_name }}" = "workflow_dispatch" ]; then
+            echo "proceed=true" >> "$GITHUB_OUTPUT"
+            exit 0
+          fi
+          TZ=Australia/Adelaide
+          if [ "$(date +%H%M)" = "0000" ]; then
+            echo "proceed=true" >> "$GITHUB_OUTPUT"
+          else
+            echo "proceed=false" >> "$GITHUB_OUTPUT"
+            echo "Skipping: not midnight Australia/Adelaide ($(date +%Y-%m-%d %H:%M %Z))"
+          fi
+
       - uses: actions/checkout@v4
+        if: steps.time_check.outputs.proceed == 'true'
 
       - name: Set build date
         id: build_date
-        run: echo "date=$(date -u +'%Y-%m-%d')" >> "$GITHUB_OUTPUT"
+        if: steps.time_check.outputs.proceed == 'true'
+        run: echo "date=$(TZ=Australia/Adelaide date +'%Y-%m-%d')" >> "$GITHUB_OUTPUT"
 
       - name: Build extension
         id: build
+        if: steps.time_check.outputs.proceed == 'true'
         uses: ./.github/actions/build-extension
         with:
           gh_release_update_check: "true"
@@ -34,6 +62,7 @@ jobs:
           release_repo: ${{ github.repository }}
 
       - name: Ensure nightly release exists
+        if: steps.time_check.outputs.proceed == 'true'
         run: |
           TITLE="Nightly (${{ steps.build_date.outputs.date }})"
           if ! gh release view "${{ env.NIGHTLY_TAG }}" 2>/dev/null; then
@@ -46,6 +75,7 @@ jobs:
           fi
 
       - name: Upload nightly assets
+        if: steps.time_check.outputs.proceed == 'true'
         run: |
           gh release upload "${{ env.NIGHTLY_TAG }}" \
             --clobber \
diff --git a/src/plugins/built-in/notificationCollector/index.ts b/src/plugins/built-in/notificationCollector/index.ts
index 8af0127c..67d49910 100644
--- a/src/plugins/built-in/notificationCollector/index.ts
+++ b/src/plugins/built-in/notificationCollector/index.ts
@@ -12,6 +12,7 @@ import {
   injectArchivedForUser,
   mountArchivedNotificationInjection,
 } from "./injectArchivedNotifications";
+import styles from "./styles.css?inline";
 
 const notificationCollectorSettings = {
   saveLocally: booleanSetting({
@@ -46,6 +47,10 @@ const notificationCollectorPlugin: Plugin<
       return () => {};
     }
 
+    const styleEl = document.createElement("style");
+    styleEl.textContent = styles;
+    document.head.appendChild(styleEl);
+
     await api.storage.loaded;
     await api.settings.loaded;
 
@@ -208,6 +213,7 @@ const notificationCollectorPlugin: Plugin<
       teardownInjection();
       document.removeEventListener("visibilitychange", handleVisibilityChange);
       pageChangeUnregister.unregister();
+      styleEl.remove();
     };
   },
 };
diff --git a/src/plugins/built-in/notificationCollector/injectArchivedNotifications.ts b/src/plugins/built-in/notificationCollector/injectArchivedNotifications.ts
index c83b4507..57785e15 100644
--- a/src/plugins/built-in/notificationCollector/injectArchivedNotifications.ts
+++ b/src/plugins/built-in/notificationCollector/injectArchivedNotifications.ts
@@ -10,6 +10,12 @@ import {
 
 const LIST_SELECTOR = '[class*="notifications__list___"]';
 const ITEMS_SELECTOR = '[class*="notifications__items___"]';
+const ITEM_SELECTOR = '[class*="notifications__item___"]';
+const BACKED_UP_CLASS = "bsplus-notification-backed-up";
+const BACKUP_BADGE_CLASS = "bsplus-notification-backup-badge";
+
+const BACKUP_CHECK_SVG =
+  '<svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="3" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><polyline points="20 6 9 17 4 12"/></svg>';
 
 function notificationTimestamp(item: Record<string, unknown>): number {
   const ms = new Date(String(item.timestamp ?? 0)).getTime();
@@ -61,9 +67,33 @@ async function tryInjectArchived(archive: ArchiveMap): Promise<boolean> {
 async function injectWithRetries(archive: ArchiveMap, attempts = 10) {
   for (let i = 0; i < attempts; i++) {
     const done = await tryInjectArchived(archive);
-    if (done) return;
+    if (done) break;
     await delay(120);
   }
+  applyBackupBadges(archive);
+}
+
+export function applyBackupBadges(archive: ArchiveMap) {
+  const backedUpIds = new Set(Object.keys(archive));
+
+  for (const itemEl of document.querySelectorAll<HTMLElement>(ITEM_SELECTOR)) {
+    const id = itemEl.getAttribute("data-id");
+    if (!id) continue;
+
+    if (backedUpIds.has(id)) {
+      itemEl.classList.add(BACKED_UP_CLASS);
+      if (!itemEl.querySelector(`.${BACKUP_BADGE_CLASS}`)) {
+        const badge = document.createElement("span");
+        badge.className = BACKUP_BADGE_CLASS;
+        badge.title = "Saved locally";
+        badge.innerHTML = BACKUP_CHECK_SVG;
+        itemEl.appendChild(badge);
+      }
+    } else {
+      itemEl.classList.remove(BACKED_UP_CLASS);
+      itemEl.querySelector(`.${BACKUP_BADGE_CLASS}`)?.remove();
+    }
+  }
 }
 
 export function mountArchivedNotificationInjection(
diff --git a/src/plugins/built-in/notificationCollector/styles.css b/src/plugins/built-in/notificationCollector/styles.css
new file mode 100644
index 00000000..109605b3
--- /dev/null
+++ b/src/plugins/built-in/notificationCollector/styles.css
@@ -0,0 +1,25 @@
+[class*="notifications__item___"].bsplus-notification-backed-up {
+  position: relative;
+}
+
+.bsplus-notification-backup-badge {
+  position: absolute;
+  top: 6px;
+  right: 6px;
+  width: 14px;
+  height: 14px;
+  border-radius: 50%;
+  background: var(--better-main, #22c55e);
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  pointer-events: none;
+  z-index: 2;
+  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
+}
+
+.bsplus-notification-backup-badge svg {
+  width: 9px;
+  height: 9px;
+  color: #fff;
+}