diff --git a/docs/rebuild-spec/02-features.md b/docs/rebuild-spec/02-features.md
index e0e8de1..3f2ef39 100644
--- a/docs/rebuild-spec/02-features.md
+++ b/docs/rebuild-spec/02-features.md
@@ -190,7 +190,7 @@
 - [x] 基础限流（post/comment/register/login/window）— SSR；完整 Limits 字数等未迁
 - [x] SMTP 配置与测试信 — SSR `/admin/settings` 邮件区
 - [x] 站点品牌文案：名称、标语、简介、keywords、Logo 字标、ICP — SSR（Logo/Favicon/OG 上传未迁）
-- [ ] SQLite 一键备份与下载
+- [x] SQLite 一键备份与下载 — SSR `/admin/settings`（仅 sqlite；写入 data 目录后下载）
 
 ---
 
diff --git a/docs/rebuild-spec/06-pages-ux.md b/docs/rebuild-spec/06-pages-ux.md
index f56f506..f256ac2 100644
--- a/docs/rebuild-spec/06-pages-ux.md
+++ b/docs/rebuild-spec/06-pages-ux.md
@@ -195,7 +195,7 @@
 | Users | 搜索；禁言；认证；设等级；调积分；授徽章 |
 | Badges | 定义自动/限定徽章 |
 | Media | 分类浏览；批量删 |
-| Settings | Tab：论坛限制、侧栏组件、伪静态、邮件、OIDC+客户端、Gitea、存储、品牌、敏感词、备份 |
+| Settings | Tab：论坛限制、侧栏组件、伪静态、邮件、OIDC+客户端、Gitea、存储、品牌、敏感词、备份 — SSR `/admin/settings` 已迁品牌/限流/侧栏/敏感词/邮件/SQLite 备份（OIDC/Gitea/存储/伪静态未迁） |
 
 ---
 
diff --git a/routers/setup.go b/routers/setup.go
index a0dda64..84448ec 100644
--- a/routers/setup.go
+++ b/routers/setup.go
@@ -109,6 +109,7 @@ func Setup(cfg *config.Config) (*gin.Engine, error) {
 		Report:     reportSvc,
 		Captcha:    captchaSvc,
 		Notify:     notifySvc,
+		Backup:     backupSvc,
 	}, authMW)
 
 	r.GET("/media/thumb/*filepath", h.ServeImageThumb)
diff --git a/routers/web/admin.go b/routers/web/admin.go
index 0ef353d..d1c0e8c 100644
--- a/routers/web/admin.go
+++ b/routers/web/admin.go
@@ -3,6 +3,7 @@ package web
 import (
 	"fmt"
 	"net/http"
+	"path/filepath"
 	"strconv"
 	"strings"
 	"time"
@@ -434,6 +435,7 @@ type adminSettingsData struct {
 	MailReady    bool
 	TestTo       string
 	AsideWidgets []adminAsideWidgetRow
+	CanBackup    bool
 }
 
 // AdminSettingsGet 设置页
@@ -468,6 +470,7 @@ func (d Deps) renderAdminSettings(ctx *webctx.Context, errMsg string) {
 		Mail:         mail,
 		MailReady:    d.Settings.MailReady(),
 		AsideWidgets: asideRows,
+		CanBackup:    models.DialectorName() == "sqlite",
 	}
 	data.Error = errMsg
 	ctx.HTML(http.StatusOK, "admin/settings", data)
@@ -645,6 +648,37 @@ func (d Deps) AdminSettingsAsideWidgetsPost(c *gin.Context) {
 	ctx.Redirect("/admin/settings")
 }
 
+// AdminSettingsBackupPost 一键导出 SQLite 备份并跳转下载
+func (d Deps) AdminSettingsBackupPost(c *gin.Context) {
+	ctx := d.ctx(c)
+	if !ctx.CheckCSRF() {
+		d.renderAdminSettings(ctx, "无效请求，请重试")
+		return
+	}
+	if d.Backup == nil {
+		d.renderAdminSettings(ctx, "备份服务未就绪")
+		return
+	}
+	path, err := d.Backup.ExportSQLite()
+	if err != nil {
+		d.renderAdminSettings(ctx, err.Error())
+		return
+	}
+	name := filepath.Base(path)
+	ctx.Redirect("/admin/settings/backup/download/" + name)
+}
+
+// AdminSettingsBackupDownload 下载 data 目录下的备份文件
+func (d Deps) AdminSettingsBackupDownload(c *gin.Context) {
+	name := c.Param("name")
+	if !strings.HasPrefix(name, "jiang13_backup_") || !strings.HasSuffix(name, ".db") {
+		c.String(http.StatusBadRequest, "无效的备份文件名")
+		return
+	}
+	path := filepath.Join(d.DataDir, name)
+	c.FileAttachment(path, name)
+}
+
 // moveAsideWidget 解析 move 值「up:id」或「down:id」并交换相邻项
 func moveAsideWidget(widgets []services.AsideWidget, move string) []services.AsideWidget {
 	parts := strings.SplitN(move, ":", 2)
diff --git a/routers/web/chrome.go b/routers/web/chrome.go
index 373597e..f37d86e 100644
--- a/routers/web/chrome.go
+++ b/routers/web/chrome.go
@@ -30,6 +30,7 @@ type Deps struct {
 	Report     *services.ReportService
 	Captcha    *services.CaptchaService
 	Notify     *services.NotifyService
+	Backup     *services.BackupService
 }
 
 // SitePageLink 导航/页脚站点单页链接
diff --git a/routers/web/home.go b/routers/web/home.go
index 2868271..49ccd72 100644
--- a/routers/web/home.go
+++ b/routers/web/home.go
@@ -76,6 +76,8 @@ func Register(r *gin.Engine, deps Deps, authMW *auth.AuthMiddleware) {
 		admin.POST("/settings/mail", deps.AdminSettingsMailPost)
 		admin.POST("/settings/mail/test", deps.AdminSettingsMailTestPost)
 		admin.POST("/settings/aside-widgets", deps.AdminSettingsAsideWidgetsPost)
+		admin.POST("/settings/backup", deps.AdminSettingsBackupPost)
+		admin.GET("/settings/backup/download/:name", deps.AdminSettingsBackupDownload)
 		admin.GET("/friend-links", deps.AdminFriendLinksGet)
 		admin.POST("/friend-links/settings", deps.AdminFriendLinksSettingsPost)
 		admin.POST("/friend-links/brand", deps.AdminFriendLinksBrandAddPost)
diff --git a/templates/admin/settings.tmpl b/templates/admin/settings.tmpl
index e338625..e761bf2 100644
--- a/templates/admin/settings.tmpl
+++ b/templates/admin/settings.tmpl
@@ -83,6 +83,17 @@
     <label>测试收件邮箱 <input name="test_to" type="email" required placeholder="you@example.com"/></label>
     <button type="submit" class="j13-btn-secondary">发送测试信</button>
   </form>
+
+  <h2>SQLite 备份</h2>
+  <p class="j13-muted">将当前数据库文件复制到 data 目录并下载。备份含用户哈希、私信等全库数据，请妥善保管。仅支持 SQLite；其它引擎请使用库方工具。</p>
+  {{if .CanBackup}}
+  <form method="post" action="/admin/settings/backup" class="j13-form j13-admin-form">
+    <input type="hidden" name="_csrf" value="{{.CSRF}}"/>
+    <button type="submit">立即备份并下载</button>
+  </form>
+  {{else}}
+  <p class="j13-muted">当前不是 SQLite，一键文件备份不可用。</p>
+  {{end}}
 </main>
 {{template "base/footer" .}}
 {{end}}