diff --git a/cwd-admin/src/api/admin.ts b/cwd-admin/src/api/admin.ts
index ea5ccf1..5b6b5cd 100644
--- a/cwd-admin/src/api/admin.ts
+++ b/cwd-admin/src/api/admin.ts
@@ -388,3 +388,23 @@ export function setupTelegramWebhook(): Promise<{ message: string; webhookUrl: s
 export function sendTelegramTestMessage(): Promise<{ message: string }> {
 	return post<{ message: string }>('/admin/settings/telegram/test', {});
 }
+
+export type S3SettingsResponse = {
+	endpoint: string;
+	accessKeyId: string;
+	secretAccessKey: string;
+	bucket: string;
+	region: string;
+};
+
+export function fetchS3Settings(): Promise<S3SettingsResponse> {
+	return get<S3SettingsResponse>('/admin/settings/s3');
+}
+
+export function saveS3Settings(data: S3SettingsResponse): Promise<{ message: string }> {
+	return put<{ message: string }>('/admin/settings/s3', data);
+}
+
+export function triggerS3Backup(): Promise<{ message: string; file: string }> {
+	return post<{ message: string; file: string }>('/admin/backup/s3', {});
+}
diff --git a/cwd-admin/src/locales/zh-CN.json b/cwd-admin/src/locales/zh-CN.json
index 3a871f7..e8ca2e3 100644
--- a/cwd-admin/src/locales/zh-CN.json
+++ b/cwd-admin/src/locales/zh-CN.json
@@ -115,6 +115,22 @@
         "desc": "一键备份或恢复系统所有数据（评论 + 配置 + 统计）。",
         "export": "全量导出",
         "import": "全量恢复"
+      },
+      "s3": {
+        "title": "S3 备份",
+        "desc": "配置 S3 兼容存储（AWS S3, Cloudflare R2, MinIO 等），并支持手动触发备份。",
+        "endpoint": "API 端点 (Endpoint)",
+        "endpointHint": "例如: https://[account_id].r2.cloudflarestorage.com",
+        "region": "区域 (Region)",
+        "regionHint": "例如: auto, us-east-1",
+        "bucket": "存储桶 (Bucket)",
+        "accessKey": "Access Key ID",
+        "secretKey": "Secret Access Key",
+        "save": "保存配置",
+        "saving": "保存中...",
+        "backup": "立即备份到 S3",
+        "backingUp": "正在备份...",
+        "success": "备份成功！文件: {file}"
       }
     },
     "logs": {
diff --git a/cwd-admin/src/views/DataView/index.vue b/cwd-admin/src/views/DataView/index.vue
index f7dde70..8a0a858 100644
--- a/cwd-admin/src/views/DataView/index.vue
+++ b/cwd-admin/src/views/DataView/index.vue
@@ -109,6 +109,62 @@
       </div>
     </div>
 
+    <!-- 5. S3 备份 -->
+    <div class="card">
+      <h3 class="card-title">{{ t("data.sections.s3.title") }}</h3>
+      <p class="card-desc">{{ t("data.sections.s3.desc") }}</p>
+
+      <div class="form-group">
+        <label class="form-label">{{ t("data.sections.s3.endpoint") }}</label>
+        <input
+          v-model="s3Config.endpoint"
+          class="form-input"
+          :placeholder="t('data.sections.s3.endpointHint')"
+        />
+      </div>
+
+      <div class="form-row">
+        <div class="form-group half">
+          <label class="form-label">{{ t("data.sections.s3.bucket") }}</label>
+          <input v-model="s3Config.bucket" class="form-input" />
+        </div>
+        <div class="form-group half">
+          <label class="form-label">{{ t("data.sections.s3.region") }}</label>
+          <input
+            v-model="s3Config.region"
+            class="form-input"
+            :placeholder="t('data.sections.s3.regionHint')"
+          />
+        </div>
+      </div>
+
+      <div class="form-row">
+        <div class="form-group half">
+          <label class="form-label">{{ t("data.sections.s3.accessKey") }}</label>
+          <input v-model="s3Config.accessKeyId" class="form-input" />
+        </div>
+        <div class="form-group half">
+          <label class="form-label">{{ t("data.sections.s3.secretKey") }}</label>
+          <input v-model="s3Config.secretAccessKey" class="form-input" />
+        </div>
+      </div>
+
+      <div class="action-row" style="margin-top: 16px">
+        <button class="card-button primary" :disabled="s3Saving" @click="handleSaveS3">
+          {{ s3Saving ? t("data.sections.s3.saving") : t("data.sections.s3.save") }}
+        </button>
+        <button
+          class="card-button secondary"
+          :disabled="s3BackingUp"
+          @click="handleS3Backup"
+        >
+          {{
+            s3BackingUp ? t("data.sections.s3.backingUp") : t("data.sections.s3.backup")
+          }}
+        </button>
+      </div>
+    </div>
+
     <!-- 隐藏的文件输入框 -->
     <input
       type="file"
@@ -161,7 +217,7 @@
 </template>
 
 <script setup lang="ts">
-import { ref } from "vue";
+import { ref, onMounted } from "vue";
 import { useI18n } from "vue-i18n";
 import {
   exportComments,
@@ -172,6 +228,10 @@ import {
   importStats,
   exportBackup,
   importBackup,
+  fetchS3Settings,
+  saveS3Settings,
+  triggerS3Backup,
+  type S3SettingsResponse,
 } from "../../api/admin";
 import { useSite } from "../../composables/useSite";
 
@@ -195,6 +255,52 @@ const showPrefixModal = ref(false);
 const urlPrefix = ref("");
 const missingPrefixCount = ref(0);
 const pendingJson = ref<any[]>([]);
+const s3Config = ref<S3SettingsResponse>({
+  endpoint: "",
+  accessKeyId: "",
+  secretAccessKey: "",
+  bucket: "",
+  region: "auto",
+});
+const s3Saving = ref(false);
+const s3BackingUp = ref(false);
+
+async function loadS3Config() {
+  try {
+    const res = await fetchS3Settings();
+    s3Config.value = res;
+  } catch (e) {
+    // silent fail or log
+  }
+}
+
+async function handleSaveS3() {
+  s3Saving.value = true;
+  try {
+    await saveS3Settings(s3Config.value);
+    showToast(t("common.saveSuccess"));
+  } catch (e: any) {
+    showToast(e.message || t("common.saveFailed"), "error");
+  } finally {
+    s3Saving.value = false;
+  }
+}
+
+async function handleS3Backup() {
+  s3BackingUp.value = true;
+  try {
+    const res = await triggerS3Backup();
+    showToast(t("data.sections.s3.success", { file: res.file }));
+  } catch (e: any) {
+    showToast(e.message || t("data.messages.exportFailed"), "error");
+  } finally {
+    s3BackingUp.value = false;
+  }
+}
+
+onMounted(() => {
+  loadS3Config();
+});
 
 function showToast(msg: string, type: "success" | "error" = "success") {
   toastMessage.value = msg;
@@ -424,4 +530,26 @@ function joinUrl(prefix: string, path: string): string {
 
 <style scoped lang="less">
 @import "../../styles/components/data.less";
+
+.form-row {
+  display: flex;
+  gap: 12px;
+  margin-top: 12px;
+}
+
+.form-group {
+  margin-top: 12px;
+}
+
+.form-group.half {
+  flex: 1;
+  margin-top: 0;
+}
+
+.form-label {
+  display: block;
+  font-size: 13px;
+  margin-bottom: 4px;
+  color: var(--text-primary);
+}
 </style>
diff --git a/cwd-api/package.json b/cwd-api/package.json
index 27e8a62..9d4b556 100644
--- a/cwd-api/package.json
+++ b/cwd-api/package.json
@@ -17,6 +17,7 @@
 		"wrangler": "^4.63.0"
 	},
 	"dependencies": {
+		"aws4fetch": "^1.0.20",
 		"hono": "^4.11.3",
 		"marked": "^17.0.1",
 		"nodemailer": "^7.0.12",
diff --git a/cwd-api/src/api/admin/s3Settings.ts b/cwd-api/src/api/admin/s3Settings.ts
new file mode 100644
index 0000000..3d48645
--- /dev/null
+++ b/cwd-api/src/api/admin/s3Settings.ts
@@ -0,0 +1,38 @@
+import { Context } from 'hono';
+import { Bindings } from '../../bindings';
+import { loadS3Settings, saveS3Settings } from '../../utils/s3Settings';
+
+export async function getS3Settings(c: Context<{ Bindings: Bindings }>) {
+	try {
+		const settings = await loadS3Settings(c.env);
+		// Hide secret key for security in UI if needed, but usually user needs to edit it.
+		// For now, return it as is, or maybe mask it partially?
+		// User usually expects to see the inputs.
+		return c.json(settings);
+	} catch (e: any) {
+		return c.json({ message: e.message || '加载 S3 配置失败' }, 500);
+	}
+}
+
+export async function updateS3Settings(c: Context<{ Bindings: Bindings }>) {
+	try {
+		const body = await c.req.json();
+		const endpoint = typeof body.endpoint === 'string' ? body.endpoint.trim() : '';
+		const accessKeyId = typeof body.accessKeyId === 'string' ? body.accessKeyId.trim() : '';
+		const secretAccessKey = typeof body.secretAccessKey === 'string' ? body.secretAccessKey.trim() : '';
+		const bucket = typeof body.bucket === 'string' ? body.bucket.trim() : '';
+		const region = typeof body.region === 'string' ? body.region.trim() : 'auto';
+
+		await saveS3Settings(c.env, {
+			endpoint,
+			accessKeyId,
+			secretAccessKey,
+			bucket,
+			region,
+		});
+
+		return c.json({ message: '保存成功' });
+	} catch (e: any) {
+		return c.json({ message: e.message || '保存失败' }, 500);
+	}
+}
diff --git a/cwd-api/src/api/admin/triggerS3Backup.ts b/cwd-api/src/api/admin/triggerS3Backup.ts
new file mode 100644
index 0000000..365623d
--- /dev/null
+++ b/cwd-api/src/api/admin/triggerS3Backup.ts
@@ -0,0 +1,54 @@
+import { Context } from 'hono';
+import { Bindings } from '../../bindings';
+import { loadS3Settings } from '../../utils/s3Settings';
+import { S3Client } from '../../utils/s3';
+import { getConfigs } from './exportConfig';
+import { getStatsData } from './exportStats';
+
+export async function triggerS3Backup(c: Context<{ Bindings: Bindings }>) {
+	try {
+		// 1. Load S3 Settings
+		const settings = await loadS3Settings(c.env);
+		if (!settings.endpoint || !settings.bucket || !settings.accessKeyId || !settings.secretAccessKey) {
+			return c.json({ message: 'S3 配置不完整，请先配置 S3 信息' }, 400);
+		}
+
+		// 2. Gather Backup Data (Logic from exportBackup.ts)
+		const { results: comments } = await c.env.CWD_DB.prepare('SELECT * FROM Comment ORDER BY priority DESC, created DESC').all();
+		const configs = await getConfigs(c.env);
+		const stats = await getStatsData(c.env);
+
+		const backupData = {
+			version: '1.0',
+			timestamp: Date.now(),
+			comments: comments,
+			settings: configs,
+			page_stats: stats.page_stats,
+			page_visit_daily: stats.page_visit_daily,
+			likes: stats.likes,
+		};
+
+		const jsonString = JSON.stringify(backupData, null, 2);
+		const dateStr = new Date().toISOString().split('T')[0];
+		const fileName = `cwd-backup-${dateStr}-${Date.now()}.json`;
+
+		// 3. Upload to S3
+		const s3 = new S3Client({
+			endpoint: settings.endpoint,
+			accessKeyId: settings.accessKeyId,
+			secretAccessKey: settings.secretAccessKey,
+			bucket: settings.bucket,
+			region: settings.region,
+		});
+
+		await s3.putObject(fileName, jsonString);
+
+		return c.json({
+			message: '备份成功',
+			file: fileName,
+		});
+	} catch (e: any) {
+		console.error('S3 Backup Error:', e);
+		return c.json({ message: e.message || 'S3 备份失败' }, 500);
+	}
+}
diff --git a/cwd-api/src/index.ts b/cwd-api/src/index.ts
index c716df9..93bc5b7 100644
--- a/cwd-api/src/index.ts
+++ b/cwd-api/src/index.ts
@@ -35,6 +35,8 @@ import { listLikes } from './api/admin/listLikes';
 import { getLikeStats } from './api/admin/likeStats';
 import { getFeatureSettings, updateFeatureSettings } from './api/admin/featureSettings';
 import { getTelegramSettings, updateTelegramSettings, setupTelegramWebhook, testTelegramMessage } from './api/admin/telegramSettings';
+import { getS3Settings, updateS3Settings } from './api/admin/s3Settings';
+import { triggerS3Backup } from './api/admin/triggerS3Backup';
 import { telegramWebhook } from './api/telegram/webhook';
 import { ensureSchema } from './utils/dbMigration';
 
@@ -340,6 +342,10 @@ app.put('/admin/settings/telegram', updateTelegramSettings);
 app.post('/admin/settings/telegram/setup', setupTelegramWebhook);
 app.post('/admin/settings/telegram/test', testTelegramMessage);
 
+app.get('/admin/settings/s3', getS3Settings);
+app.put('/admin/settings/s3', updateS3Settings);
+app.post('/admin/backup/s3', triggerS3Backup);
+
 app.get('/admin/settings/admin-display', async (c) => {
 	try {
 		const settings = await loadAdminDisplaySettings(c.env);
diff --git a/cwd-api/src/utils/s3.ts b/cwd-api/src/utils/s3.ts
new file mode 100644
index 0000000..5cf6083
--- /dev/null
+++ b/cwd-api/src/utils/s3.ts
@@ -0,0 +1,52 @@
+import { AwsClient } from 'aws4fetch';
+
+export interface S3Config {
+	endpoint: string;
+	accessKeyId: string;
+	secretAccessKey: string;
+	bucket: string;
+	region?: string;
+}
+
+export class S3Client {
+	private client: AwsClient;
+	private bucket: string;
+	private endpoint: string;
+
+	constructor(config: S3Config) {
+		this.client = new AwsClient({
+			accessKeyId: config.accessKeyId,
+			secretAccessKey: config.secretAccessKey,
+			region: config.region || 'auto',
+			service: 's3',
+		});
+		this.bucket = config.bucket;
+		// Ensure endpoint doesn't have trailing slash
+		this.endpoint = config.endpoint.replace(/\/$/, '');
+	}
+
+	async putObject(key: string, body: string | Uint8Array | Blob) {
+		const url = `${this.endpoint}/${this.bucket}/${key}`;
+		// Some S3 compatible storages need path style access
+		// If endpoint is like https://s3.amazonaws.com, it might need virtual host style
+		// But for broad compatibility (MinIO, R2, etc.), path style is often safer if endpoint is custom.
+		// However, aws4fetch handles signing.
+
+		// Let's try to construct URL carefully.
+		// If endpoint includes bucket in hostname, we shouldn't add it to path.
+		// But assuming user provides a generic endpoint (e.g. https://<account>.r2.cloudflarestorage.com)
+		// We will append bucket to path: https://<endpoint>/<bucket>/<key>
+
+		const res = await this.client.fetch(url, {
+			method: 'PUT',
+			body,
+		});
+
+		if (!res.ok) {
+			const text = await res.text();
+			throw new Error(`S3 Upload Failed: ${res.status} ${res.statusText} - ${text}`);
+		}
+
+		return res;
+	}
+}
diff --git a/cwd-api/src/utils/s3Settings.ts b/cwd-api/src/utils/s3Settings.ts
new file mode 100644
index 0000000..5559eb8
--- /dev/null
+++ b/cwd-api/src/utils/s3Settings.ts
@@ -0,0 +1,49 @@
+import { Bindings } from '../bindings';
+
+const S3_CONFIG_KEY = 's3_config';
+
+export interface S3Settings {
+	endpoint: string;
+	accessKeyId: string;
+	secretAccessKey: string;
+	bucket: string;
+	region: string;
+}
+
+export async function loadS3Settings(env: Bindings): Promise<S3Settings> {
+	await env.CWD_DB.prepare('CREATE TABLE IF NOT EXISTS Settings (key TEXT PRIMARY KEY, value TEXT NOT NULL)').run();
+	const row = await env.CWD_DB.prepare('SELECT value FROM Settings WHERE key = ?')
+		.bind(S3_CONFIG_KEY)
+		.first<{ value: string }>();
+
+	const defaults: S3Settings = {
+		endpoint: '',
+		accessKeyId: '',
+		secretAccessKey: '',
+		bucket: '',
+		region: 'auto',
+	};
+
+	if (!row || !row.value) {
+		return defaults;
+	}
+
+	try {
+		const parsed = JSON.parse(row.value);
+		return {
+			endpoint: parsed.endpoint || '',
+			accessKeyId: parsed.accessKeyId || '',
+			secretAccessKey: parsed.secretAccessKey || '',
+			bucket: parsed.bucket || '',
+			region: parsed.region || 'auto',
+		};
+	} catch {
+		return defaults;
+	}
+}
+
+export async function saveS3Settings(env: Bindings, settings: S3Settings) {
+	await env.CWD_DB.prepare('CREATE TABLE IF NOT EXISTS Settings (key TEXT PRIMARY KEY, value TEXT NOT NULL)').run();
+	const value = JSON.stringify(settings);
+	await env.CWD_DB.prepare('REPLACE INTO Settings (key, value) VALUES (?, ?)').bind(S3_CONFIG_KEY, value).run();
+}