diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1b5e21d..31c295b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,10 @@
 # Changelog
 
+## [1.9.5]
+
+- Added Backup & Restore to the options page — download all extension data (model snapshots, export history, preferences) to a JSON file and restore it later
+- Survives uninstall/reinstall, and lets you move data between browsers, devices, or extension builds (e.g. store version ↔ GitHub build)
+
 ## [1.9.4]
 
 - Browse table's Model column now shows each chat's original (first-seen) model from the snapshot data, falling back to the current/inferred model when no snapshot exists
diff --git a/TODO.md b/TODO.md
index 2e49f4e..fbcc3d3 100644
--- a/TODO.md
+++ b/TODO.md
@@ -128,6 +128,12 @@
   - Moved `formatModelName`, `getModelBadgeClass`, `DEFAULT_MODEL_TIMELINE` out of `content.js`/`browse.js` into shared `utils.js`
   - Doc-linked the Anthropic model-ID schema in code comments
 
+- **Backup & Restore for extension data** (v1.9.5)
+  - Options page can download all `chrome.storage.local` + `chrome.storage.sync` data to a JSON file and restore it
+  - Solves uninstall/reinstall data loss, and migration between separate extension builds (store vs. GitHub) which have separate storage
+  - Backup file is structured `{ _meta, local, sync }`; restore validates `_meta.app` and confirms before overwriting
+  - Future enhancement: smart per-key merge on restore (e.g. union `modelSnapshots`, keep earliest `firstSeen`) instead of overwrite
+
 ## Pending 🔄
 
 ### Critical Priority 🔴
diff --git a/chrome/manifest.json b/chrome/manifest.json
index 7ba69d2..bb515a7 100644
--- a/chrome/manifest.json
+++ b/chrome/manifest.json
@@ -1,7 +1,7 @@
 {
     "manifest_version": 3,
     "name": "Claude Exporter Beta",
-    "version": "1.9.4",
+    "version": "1.9.5",
     "description": "Export conversations and artifacts from Claude.ai",
       "permissions": [
     "activeTab",
diff --git a/chrome/options.html b/chrome/options.html
index b2b1e2a..31444c2 100644
--- a/chrome/options.html
+++ b/chrome/options.html
@@ -175,6 +175,15 @@
     <div id="testStatus" class="status"></div>
   </div>
 
+  <div class="section">
+    <h3>Backup &amp; Restore</h3>
+    <p>Save the extension's data — model snapshots, export history, and preferences — to a file you can restore later. Useful before uninstalling, or to move your data to another browser, device, or extension build.</p>
+    <button id="backupBtn" style="margin-right: 8px;">Download Backup</button>
+    <button id="restoreBtn">Restore from File</button>
+    <input type="file" id="restoreFile" accept="application/json,.json" style="display: none;">
+    <div id="backupStatus" class="status"></div>
+  </div>
+
   <script src="options.js"></script>
 </body>
 </html>
diff --git a/chrome/options.js b/chrome/options.js
index 71d4759..6845b2e 100644
--- a/chrome/options.js
+++ b/chrome/options.js
@@ -64,6 +64,86 @@ document.getElementById('testBtn').addEventListener('click', async () => {
   }
 });
 
+// Backup all extension data to a file
+document.getElementById('backupBtn').addEventListener('click', () => {
+  chrome.storage.local.get(null, (local) => {
+    chrome.storage.sync.get(null, (sync) => {
+      const backup = {
+        _meta: {
+          app: 'claude-exporter',
+          backupVersion: 1,
+          extensionVersion: chrome.runtime.getManifest().version,
+          createdAt: new Date().toISOString()
+        },
+        local: local || {},
+        sync: sync || {}
+      };
+      const blob = new Blob([JSON.stringify(backup, null, 2)], { type: 'application/json' });
+      const url = URL.createObjectURL(blob);
+      const a = document.createElement('a');
+      a.href = url;
+      a.download = `claude-exporter-backup-${new Date().toISOString().replace(/[:.]/g, '-').slice(0, 19)}.json`;
+      document.body.appendChild(a);
+      a.click();
+      document.body.removeChild(a);
+      URL.revokeObjectURL(url);
+      const snapCount = Object.keys(backup.local.modelSnapshots || {}).length;
+      const exportCount = Object.keys(backup.local.exportTimestamps || {}).length;
+      showStatus('backupStatus', `Backup downloaded — ${snapCount} model snapshot(s), ${exportCount} export record(s).`, 'success');
+    });
+  });
+});
+
+// Restore extension data from a backup file
+document.getElementById('restoreBtn').addEventListener('click', () => {
+  document.getElementById('restoreFile').click();
+});
+
+document.getElementById('restoreFile').addEventListener('change', (event) => {
+  const file = event.target.files[0];
+  event.target.value = ''; // allow re-selecting the same file later
+  if (!file) return;
+
+  const reader = new FileReader();
+  reader.onload = (e) => {
+    let backup;
+    try {
+      backup = JSON.parse(e.target.result);
+    } catch (err) {
+      showStatus('backupStatus', 'Restore failed: the file is not valid JSON.', 'error');
+      return;
+    }
+
+    // Make sure this is actually one of our backup files
+    if (!backup || typeof backup !== 'object' || !backup._meta ||
+        backup._meta.app !== 'claude-exporter' || typeof backup.local !== 'object') {
+      showStatus('backupStatus', 'Restore failed: this does not look like a Claude Exporter backup file.', 'error');
+      return;
+    }
+
+    const snapCount = Object.keys(backup.local.modelSnapshots || {}).length;
+    const exportCount = Object.keys(backup.local.exportTimestamps || {}).length;
+    const proceed = confirm(
+      `Restore this backup?\n\n` +
+      `It contains ${snapCount} model snapshot(s) and ${exportCount} export record(s), ` +
+      `created ${backup._meta.createdAt || 'an unknown date'}.\n\n` +
+      `This overwrites the extension's current data with the backup's contents.`
+    );
+    if (!proceed) {
+      showStatus('backupStatus', 'Restore cancelled.', 'error');
+      return;
+    }
+
+    chrome.storage.local.set(backup.local, () => {
+      const syncData = (backup.sync && typeof backup.sync === 'object') ? backup.sync : {};
+      chrome.storage.sync.set(syncData, () => {
+        showStatus('backupStatus', `Restore complete — ${snapCount} model snapshot(s), ${exportCount} export record(s) restored. Reload any open Claude pages and the browse page to see the changes.`, 'success');
+      });
+    });
+  };
+  reader.readAsText(file);
+});
+
 // Helper functions
 function showStatus(elementId, message, type) {
   const statusEl = document.getElementById(elementId);
diff --git a/firefox/manifest.json b/firefox/manifest.json
index 50ce678..77a800c 100644
--- a/firefox/manifest.json
+++ b/firefox/manifest.json
@@ -1,7 +1,7 @@
 {
   "manifest_version": 2,
   "name": "Claude Exporter Beta",
-  "version": "1.9.4",
+  "version": "1.9.5",
   "description": "Export conversations and artifacts from Claude.ai",
   "permissions": [
     "activeTab",
diff --git a/firefox/options.html b/firefox/options.html
index b2b1e2a..31444c2 100644
--- a/firefox/options.html
+++ b/firefox/options.html
@@ -175,6 +175,15 @@
     <div id="testStatus" class="status"></div>
   </div>
 
+  <div class="section">
+    <h3>Backup &amp; Restore</h3>
+    <p>Save the extension's data — model snapshots, export history, and preferences — to a file you can restore later. Useful before uninstalling, or to move your data to another browser, device, or extension build.</p>
+    <button id="backupBtn" style="margin-right: 8px;">Download Backup</button>
+    <button id="restoreBtn">Restore from File</button>
+    <input type="file" id="restoreFile" accept="application/json,.json" style="display: none;">
+    <div id="backupStatus" class="status"></div>
+  </div>
+
   <script src="options.js"></script>
 </body>
 </html>
diff --git a/firefox/options.js b/firefox/options.js
index 71d4759..6845b2e 100644
--- a/firefox/options.js
+++ b/firefox/options.js
@@ -64,6 +64,86 @@ document.getElementById('testBtn').addEventListener('click', async () => {
   }
 });
 
+// Backup all extension data to a file
+document.getElementById('backupBtn').addEventListener('click', () => {
+  chrome.storage.local.get(null, (local) => {
+    chrome.storage.sync.get(null, (sync) => {
+      const backup = {
+        _meta: {
+          app: 'claude-exporter',
+          backupVersion: 1,
+          extensionVersion: chrome.runtime.getManifest().version,
+          createdAt: new Date().toISOString()
+        },
+        local: local || {},
+        sync: sync || {}
+      };
+      const blob = new Blob([JSON.stringify(backup, null, 2)], { type: 'application/json' });
+      const url = URL.createObjectURL(blob);
+      const a = document.createElement('a');
+      a.href = url;
+      a.download = `claude-exporter-backup-${new Date().toISOString().replace(/[:.]/g, '-').slice(0, 19)}.json`;
+      document.body.appendChild(a);
+      a.click();
+      document.body.removeChild(a);
+      URL.revokeObjectURL(url);
+      const snapCount = Object.keys(backup.local.modelSnapshots || {}).length;
+      const exportCount = Object.keys(backup.local.exportTimestamps || {}).length;
+      showStatus('backupStatus', `Backup downloaded — ${snapCount} model snapshot(s), ${exportCount} export record(s).`, 'success');
+    });
+  });
+});
+
+// Restore extension data from a backup file
+document.getElementById('restoreBtn').addEventListener('click', () => {
+  document.getElementById('restoreFile').click();
+});
+
+document.getElementById('restoreFile').addEventListener('change', (event) => {
+  const file = event.target.files[0];
+  event.target.value = ''; // allow re-selecting the same file later
+  if (!file) return;
+
+  const reader = new FileReader();
+  reader.onload = (e) => {
+    let backup;
+    try {
+      backup = JSON.parse(e.target.result);
+    } catch (err) {
+      showStatus('backupStatus', 'Restore failed: the file is not valid JSON.', 'error');
+      return;
+    }
+
+    // Make sure this is actually one of our backup files
+    if (!backup || typeof backup !== 'object' || !backup._meta ||
+        backup._meta.app !== 'claude-exporter' || typeof backup.local !== 'object') {
+      showStatus('backupStatus', 'Restore failed: this does not look like a Claude Exporter backup file.', 'error');
+      return;
+    }
+
+    const snapCount = Object.keys(backup.local.modelSnapshots || {}).length;
+    const exportCount = Object.keys(backup.local.exportTimestamps || {}).length;
+    const proceed = confirm(
+      `Restore this backup?\n\n` +
+      `It contains ${snapCount} model snapshot(s) and ${exportCount} export record(s), ` +
+      `created ${backup._meta.createdAt || 'an unknown date'}.\n\n` +
+      `This overwrites the extension's current data with the backup's contents.`
+    );
+    if (!proceed) {
+      showStatus('backupStatus', 'Restore cancelled.', 'error');
+      return;
+    }
+
+    chrome.storage.local.set(backup.local, () => {
+      const syncData = (backup.sync && typeof backup.sync === 'object') ? backup.sync : {};
+      chrome.storage.sync.set(syncData, () => {
+        showStatus('backupStatus', `Restore complete — ${snapCount} model snapshot(s), ${exportCount} export record(s) restored. Reload any open Claude pages and the browse page to see the changes.`, 'success');
+      });
+    });
+  };
+  reader.readAsText(file);
+});
+
 // Helper functions
 function showStatus(elementId, message, type) {
   const statusEl = document.getElementById(elementId);