diff --git a/app/components/FileLibraryPanel.vue b/app/components/FileLibraryPanel.vue
index ecc7fdf..cbbccb2 100644
--- a/app/components/FileLibraryPanel.vue
+++ b/app/components/FileLibraryPanel.vue
@@ -2,6 +2,7 @@
 import type { FileItem, FileListResponse } from '~/types/file'
 import type { LibraryStatsData } from '~/types/media'
 import { formatFileSize } from '~/composables/useFileSize'
+import SiteSyncSelectedDialog from '~/components/storage/SiteSyncSelectedDialog.vue'
 
 const props = withDefaults(defineProps<{
   /** 文件库（file）与视频库结构一致，保留参数以便复用 */
@@ -32,6 +33,7 @@ const deleteModalOpen = ref(false)
 const deleteTargetKeys = ref<string[]>([])
 const deleting = ref(false)
 const batchTagOpen = ref(false)
+const syncOpen = ref(false)
 
 const currentBackend = ref('all')
 const currentSource = ref('all')
@@ -42,6 +44,7 @@ const activeUntaggedOnly = ref(false)
 const { viewMode } = useLibraryView(props.kind)
 
 const selectedCount = computed(() => selectedKeys.value.size)
+const syncKeys = computed(() => [...selectedKeys.value])
 
 const pageText = computed(() => props.kind === 'video'
   ? {
@@ -263,6 +266,10 @@ function openBatchTags() {
   batchTagOpen.value = true
 }
 
+function openSync() {
+  syncOpen.value = true
+}
+
 function requestDelete(item: FileItem) {
   if (!isAuthenticated.value) return
   deleteTargetKeys.value = [item.key]
@@ -471,6 +478,16 @@ defineExpose({ refresh })
             :label="t('library.batchDelete')"
             @click="requestBatchDelete"
           />
+          <UButton
+            v-if="selectedCount > 0"
+            icon="i-lucide-cloud-upload"
+            variant="outline"
+            color="neutral"
+            size="sm"
+            :disabled="!selectedCount || loading"
+            :label="t('storage.backup.syncSelectedAction')"
+            @click="openSync"
+          />
           <div class="flex gap-0.5 rounded-lg border border-default p-0.5">
             <UButton
               icon="i-lucide-layout-grid"
@@ -700,5 +717,11 @@ defineExpose({ refresh })
       :selected-count="selectedCount"
       @confirm="confirmBatchTags"
     />
+
+    <SiteSyncSelectedDialog
+      v-model:open="syncOpen"
+      :keys="syncKeys"
+      scope="file"
+    />
   </div>
 </template>
diff --git a/app/components/VideoLibraryPanel.vue b/app/components/VideoLibraryPanel.vue
index 0ff0cdb..dcc3e36 100644
--- a/app/components/VideoLibraryPanel.vue
+++ b/app/components/VideoLibraryPanel.vue
@@ -2,6 +2,7 @@
 import type { FileItem, FileListResponse } from '~/types/file'
 import type { LibraryStatsData } from '~/types/media'
 import { formatFileSize } from '~/composables/useFileSize'
+import SiteSyncSelectedDialog from '~/components/storage/SiteSyncSelectedDialog.vue'
 
 const { isAuthenticated, handleAuthError } = useAuth()
 const toast = useToast()
@@ -24,6 +25,7 @@ const stats = ref<LibraryStatsData | null>(null)
 const selectedKeys = ref<Set<string>>(new Set())
 const deleteModalOpen = ref(false)
 const batchTagOpen = ref(false)
+const syncOpen = ref(false)
 const deleteTargetKeys = ref<string[]>([])
 const deleting = ref(false)
 const previewOpen = ref(false)
@@ -40,6 +42,7 @@ const activeUntaggedOnly = ref(false)
 const { viewMode } = useLibraryView('video')
 
 const selectedCount = computed(() => selectedKeys.value.size)
+const syncKeys = computed(() => [...selectedKeys.value])
 
 const backendItems = computed(() => [
   { label: t('stats.filterStorageAll'), value: 'all' },
@@ -246,6 +249,10 @@ function openBatchTags() {
   batchTagOpen.value = true
 }
 
+function openSync() {
+  syncOpen.value = true
+}
+
 async function confirmBatchTags(tagIds: number[], action: 'add' | 'remove') {
   const keys = [...selectedKeys.value]
   if (!keys.length || !tagIds.length) return
@@ -470,6 +477,16 @@ defineExpose({ refresh })
             :label="t('library.batchDelete')"
             @click="requestBatchDelete"
           />
+          <UButton
+            v-if="selectedCount > 0"
+            icon="i-lucide-cloud-upload"
+            variant="outline"
+            color="neutral"
+            size="sm"
+            :disabled="!selectedCount || loading"
+            :label="t('storage.backup.syncSelectedAction')"
+            @click="openSync"
+          />
           <div class="flex gap-0.5 rounded-lg border border-default p-0.5">
             <UButton
               icon="i-lucide-layout-grid"
@@ -743,6 +760,12 @@ defineExpose({ refresh })
       @confirm="confirmBatchTags"
     />
 
+    <SiteSyncSelectedDialog
+      v-model:open="syncOpen"
+      :keys="syncKeys"
+      scope="video"
+    />
+
     <VideoPreviewModal
       v-model:open="previewOpen"
       :item="previewItem"
diff --git a/app/components/gallery/GalleryFilterBar.vue b/app/components/gallery/GalleryFilterBar.vue
index 3064282..97b864d 100644
--- a/app/components/gallery/GalleryFilterBar.vue
+++ b/app/components/gallery/GalleryFilterBar.vue
@@ -14,11 +14,13 @@ const props = withDefaults(defineProps<{
   loading?: boolean
   showBatchDelete?: boolean
   showBatchTags?: boolean
+  showBatchSync?: boolean
 }>(), {
   selectedCount: 0,
   loading: false,
   showBatchDelete: true,
   showBatchTags: false,
+  showBatchSync: false,
   tagIds: () => [],
   tags: () => [],
   tagMode: 'or',
@@ -37,6 +39,7 @@ const emit = defineEmits<{
   'reset': []
   'batch-delete': []
   'batch-tags': []
+  'batch-sync': []
   'manage-tags': []
 }>()
 
@@ -155,6 +158,20 @@ function viewButtonClass(active: boolean) {
       {{ t('stats.batchDelete') }}
     </UButton>
 
+    <UButton
+      v-if="showBatchSync"
+      type="button"
+      icon="i-lucide-cloud-upload"
+      size="sm"
+      variant="outline"
+      color="neutral"
+      class="shrink-0"
+      :disabled="!selectedCount || loading"
+      @click="emit('batch-sync')"
+    >
+      {{ t('storage.backup.syncSelectedAction') }}
+    </UButton>
+
     <div
       class="inline-flex shrink-0 overflow-hidden rounded-md border border-default"
       role="group"
diff --git a/app/components/storage/SiteSyncCard.vue b/app/components/storage/SiteSyncCard.vue
index 99889d5..278e977 100644
--- a/app/components/storage/SiteSyncCard.vue
+++ b/app/components/storage/SiteSyncCard.vue
@@ -28,6 +28,14 @@ const targetBaseUrl = ref('')
 const token = ref('')
 const conflictMode = ref<'skip' | 'overwrite'>('skip')
 const direction = ref<SiteSyncDirection>('push')
+const scope = ref<'all' | 'image' | 'video' | 'file'>('all')
+
+const scopeItems = computed(() => [
+  { value: 'all' as const, label: t('storage.backup.siteSyncScopeAll') },
+  { value: 'image' as const, label: t('storage.backup.siteSyncScopeImage') },
+  { value: 'video' as const, label: t('storage.backup.siteSyncScopeVideo') },
+  { value: 'file' as const, label: t('storage.backup.siteSyncScopeFile') }
+])
 
 watch(() => props.resumableJob, (job) => {
   if (!job) return
@@ -99,6 +107,7 @@ function submit(resume = false) {
     token: token.value.trim(),
     conflictMode: conflictMode.value,
     direction: direction.value,
+    scope: scope.value,
     ...(resume && props.resumableJob ? { resumeJobId: props.resumableJob.id } : {})
   })
   token.value = ''
@@ -132,6 +141,10 @@ function setConflictMode(mode: 'skip' | 'overwrite') {
 function setDirection(value: SiteSyncDirection) {
   direction.value = value
 }
+
+function setScope(value: 'all' | 'image' | 'video' | 'file') {
+  scope.value = value
+}
 </script>
 
 <template>
@@ -247,6 +260,20 @@ function setDirection(value: SiteSyncDirection) {
       </div>
     </div>
 
+    <div class="mt-3 flex flex-wrap items-center gap-2">
+      <span class="text-xs text-muted">{{ t('storage.backup.siteSyncContent') }}</span>
+      <UButton
+        v-for="item in scopeItems"
+        :key="item.value"
+        size="xs"
+        :variant="scope === item.value ? 'solid' : 'ghost'"
+        :color="scope === item.value ? 'primary' : 'neutral'"
+        :label="item.label"
+        :disabled="busy || disabled"
+        @click="setScope(item.value)"
+      />
+    </div>
+
     <UAlert
       v-if="activeJob"
       class="mt-4"
diff --git a/app/components/storage/SiteSyncSelectedDialog.vue b/app/components/storage/SiteSyncSelectedDialog.vue
new file mode 100644
index 0000000..ac0827c
--- /dev/null
+++ b/app/components/storage/SiteSyncSelectedDialog.vue
@@ -0,0 +1,119 @@
+<script setup lang="ts">
+const props = defineProps<{
+  open: boolean
+  keys: string[]
+  scope: 'image' | 'video' | 'file'
+}>()
+
+const emit = defineEmits<{
+  'update:open': [value: boolean]
+}>()
+
+const { t } = useI18n()
+const { startSiteSync } = useBackup()
+
+const targetBaseUrl = ref('')
+const token = ref('')
+const conflictMode = ref<'skip' | 'overwrite'>('skip')
+const busy = ref(false)
+
+const canSubmit = computed(() =>
+  !busy.value
+  && props.keys.length > 0
+  && Boolean(targetBaseUrl.value.trim())
+  && Boolean(token.value.trim())
+)
+
+function setConflict(mode: 'skip' | 'overwrite') {
+  conflictMode.value = mode
+}
+
+async function submit() {
+  if (!canSubmit.value) return
+  busy.value = true
+  try {
+    await startSiteSync({
+      targetBaseUrl: targetBaseUrl.value.trim(),
+      token: token.value.trim(),
+      conflictMode: conflictMode.value,
+      direction: 'push',
+      scope: props.scope,
+      keys: props.keys
+    })
+    emit('update:open', false)
+  } catch {
+    // useBackup 已提示错误
+  } finally {
+    busy.value = false
+  }
+}
+</script>
+
+<template>
+  <UModal
+    :open="open"
+    :title="t('storage.backup.syncSelectedTitle')"
+    :description="t('storage.backup.syncSelectedSubtitle', { n: keys.length })"
+    @update:open="emit('update:open', $event)"
+  >
+    <template #body>
+      <div class="space-y-3">
+        <div class="space-y-1.5">
+          <label class="text-xs text-muted">{{ t('storage.backup.siteSyncTarget') }}</label>
+          <UInput
+            v-model="targetBaseUrl"
+            placeholder="https://target.example.com"
+            size="sm"
+            class="w-full"
+          />
+        </div>
+        <div class="space-y-1.5">
+          <label class="text-xs text-muted">{{ t('storage.backup.siteSyncToken') }}</label>
+          <UInput
+            v-model="token"
+            type="password"
+            :placeholder="t('storage.backup.siteSyncTokenPlaceholder')"
+            size="sm"
+            class="w-full"
+          />
+        </div>
+        <div class="flex flex-wrap items-center gap-2">
+          <span class="text-xs text-muted">{{ t('storage.backup.siteSyncConflict') }}</span>
+          <UButton
+            size="xs"
+            :variant="conflictMode === 'skip' ? 'solid' : 'ghost'"
+            :color="conflictMode === 'skip' ? 'primary' : 'neutral'"
+            :label="t('storage.backup.siteSyncSkip')"
+            @click="setConflict('skip')"
+          />
+          <UButton
+            size="xs"
+            :variant="conflictMode === 'overwrite' ? 'solid' : 'ghost'"
+            :color="conflictMode === 'overwrite' ? 'primary' : 'neutral'"
+            :label="t('storage.backup.siteSyncOverwrite')"
+            @click="setConflict('overwrite')"
+          />
+        </div>
+      </div>
+    </template>
+
+    <template #footer>
+      <div class="flex justify-end gap-2">
+        <UButton
+          :label="t('common.cancel')"
+          color="neutral"
+          variant="outline"
+          @click="emit('update:open', false)"
+        />
+        <UButton
+          :label="t('storage.backup.syncSelectedStart')"
+          icon="i-lucide-cloud-upload"
+          color="primary"
+          :loading="busy"
+          :disabled="!canSubmit"
+          @click="submit"
+        />
+      </div>
+    </template>
+  </UModal>
+</template>
diff --git a/app/pages/gallery.vue b/app/pages/gallery.vue
index b124d97..b8694d6 100644
--- a/app/pages/gallery.vue
+++ b/app/pages/gallery.vue
@@ -1,5 +1,6 @@
 <script setup lang="ts">
 import type { ImageItem } from '~/types/image'
+import SiteSyncSelectedDialog from '~/components/storage/SiteSyncSelectedDialog.vue'
 
 interface StatsResponse {
   uploadToday: number
@@ -74,6 +75,7 @@ const previewOpen = ref(false)
 const previewImage = ref<ImageItem | null>(null)
 const { viewMode } = useLibraryView('image')
 const batchTagOpen = ref(false)
+const syncOpen = ref(false)
 
 const currentUploadSource = ref('all')
 const currentStorageBackend = ref('all')
@@ -93,6 +95,7 @@ const storageBackendItems = computed(() => [
 ])
 
 const selectedCount = computed(() => selectedKeys.value.size)
+const syncKeys = computed(() => [...selectedKeys.value])
 
 function onWindowScroll() {
   showScrollTop.value = window.scrollY > 400
@@ -266,6 +269,10 @@ function goToTagSettings() {
   void navigateTo({ path: '/settings', query: { tab: 'tags' } })
 }
 
+function openSync() {
+  syncOpen.value = true
+}
+
 function updateSelectedKeys(keys: Set<string>) {
   selectedKeys.value = keys
 }
@@ -495,6 +502,7 @@ watch(isAuthenticated, async (authed, prev) => {
             :loading="galleryLoading"
             :show-batch-delete="true"
             :show-batch-tags="selectedCount > 0"
+            :show-batch-sync="selectedCount > 0"
             @update:storage-backend="handleStorageBackendChange"
             @update:upload-source="handleUploadSourceChange"
             @update:tag-ids="handleTagIdsChange"
@@ -505,6 +513,7 @@ watch(isAuthenticated, async (authed, prev) => {
             @reset="handleResetFilters"
             @batch-delete="requestBatchDelete"
             @batch-tags="batchTagOpen = true"
+            @batch-sync="openSync"
             @manage-tags="goToTagSettings"
           />
         </div>
@@ -591,6 +600,12 @@ watch(isAuthenticated, async (authed, prev) => {
         @confirm="confirmBatchTags"
       />
 
+      <SiteSyncSelectedDialog
+        v-model:open="syncOpen"
+        :keys="syncKeys"
+        scope="image"
+      />
+
       <UButton
         v-show="showScrollTop"
         icon="i-lucide-arrow-up"
diff --git a/app/types/backup.ts b/app/types/backup.ts
index d290051..b9a90db 100644
--- a/app/types/backup.ts
+++ b/app/types/backup.ts
@@ -60,6 +60,10 @@ export interface SiteSyncRequest {
   token: string
   conflictMode: 'skip' | 'overwrite'
   direction: SiteSyncDirection
+  /** 同步内容：全站或某一类媒体 */
+  scope?: 'all' | 'image' | 'video' | 'file'
+  /** 指定资源（同一类型） */
+  keys?: string[]
   resumeJobId?: string
   abandonJobId?: string
 }
diff --git a/i18n/locales/en.json b/i18n/locales/en.json
index aaef90d..9286b9e 100644
--- a/i18n/locales/en.json
+++ b/i18n/locales/en.json
@@ -702,6 +702,15 @@
       "siteSyncPush": "Push to target",
       "siteSyncPull": "Pull from target",
       "siteSyncConflict": "Conflict policy:",
+    "siteSyncContent": "Content:",
+    "siteSyncScopeAll": "Everything",
+    "siteSyncScopeImage": "Images only",
+    "siteSyncScopeVideo": "Videos only",
+    "siteSyncScopeFile": "Files only",
+    "syncSelectedTitle": "Sync selected",
+    "syncSelectedSubtitle": "Push the {n} selected item(s) to another PicHost",
+    "syncSelectedStart": "Start sync",
+    "syncSelectedAction": "Sync to site",
       "siteSyncSkip": "Skip existing",
       "siteSyncOverwrite": "Overwrite existing",
       "siteSyncResume": "Resume last sync",
diff --git a/i18n/locales/zh-CN.json b/i18n/locales/zh-CN.json
index b328a1d..93ce808 100644
--- a/i18n/locales/zh-CN.json
+++ b/i18n/locales/zh-CN.json
@@ -702,6 +702,15 @@
       "siteSyncPush": "推送到目标站点",
       "siteSyncPull": "从目标站点拉取",
       "siteSyncConflict": "冲突策略：",
+    "siteSyncContent": "同步内容：",
+    "siteSyncScopeAll": "全站",
+    "siteSyncScopeImage": "仅图库",
+    "siteSyncScopeVideo": "仅视频库",
+    "siteSyncScopeFile": "仅文件库",
+    "syncSelectedTitle": "同步选中资源",
+    "syncSelectedSubtitle": "将选中的 {n} 项推送到另一台 PicHost",
+    "syncSelectedStart": "开始同步",
+    "syncSelectedAction": "同步给目标站点",
       "siteSyncSkip": "跳过已存在",
       "siteSyncOverwrite": "覆盖已存在",
       "siteSyncResume": "继续上次同步",
diff --git a/server/api/admin/site-sync.post.ts b/server/api/admin/site-sync.post.ts
index ae5c114..574ec73 100644
--- a/server/api/admin/site-sync.post.ts
+++ b/server/api/admin/site-sync.post.ts
@@ -12,6 +12,8 @@ interface SiteSyncBody {
   token?: string
   conflictMode?: 'skip' | 'overwrite'
   direction?: 'push' | 'pull'
+  scope?: 'all' | 'image' | 'video' | 'file'
+  keys?: string[]
   resumeJobId?: string
   abandonJobId?: string
 }
@@ -49,7 +51,13 @@ export default defineEventHandler(async (event) => {
       job = startSiteSyncJob({
         targetBaseUrl: targetUrl.toString(),
         conflictMode,
-        direction
+        direction,
+        scope: body?.scope === 'image' || body?.scope === 'video' || body?.scope === 'file'
+          ? body.scope
+          : 'all',
+        ...(Array.isArray(body?.keys) && body.keys.length
+          ? { keys: body.keys.filter(key => typeof key === 'string') }
+          : {})
       }, token, user.id)
     }
     return { job: serializeBackupJob(job) }
diff --git a/server/utils/site-sync/runner.ts b/server/utils/site-sync/runner.ts
index de4b052..2dbc81c 100644
--- a/server/utils/site-sync/runner.ts
+++ b/server/utils/site-sync/runner.ts
@@ -58,8 +58,14 @@ export interface SiteSyncOptions {
   targetBaseUrl: string
   conflictMode: 'skip' | 'overwrite'
   direction: SiteSyncDirection
+  /** 同步内容：全站或某一类媒体 */
+  scope?: SiteSyncScope
+  /** 指定资源（与 scope 互斥，限定同一类型） */
+  keys?: string[]
 }
 
+export type SiteSyncScope = 'all' | 'image' | 'video' | 'file'
+
 const tokens = (globalThis as typeof globalThis & {
   __pichostSiteSyncTokens?: Map<string, string>
 }).__pichostSiteSyncTokens ?? new Map<string, string>()
@@ -948,7 +954,13 @@ export async function runSiteSyncJob(
     const targetUsers = new Set(inventory.users)
     const targetMedia = new Set(inventory.mediaKeys)
     const targetObjects = new Map(inventory.objects.map(item => [item.key, item.size]))
-    const rows = listAllImageIndexRows()
+    const allRows = listAllImageIndexRows()
+    const wantedKeys = new Set(options.keys ?? [])
+    const rows = allRows.filter((row) => {
+      if (wantedKeys.size) return wantedKeys.has(row.key)
+      const scope = options.scope ?? 'all'
+      return scope === 'all' || row.media_type === scope
+    })
     const ownerMap = listUserIdUsernameMap()
     const job = getBackupJob(jobId)
     const checkpoint = job?.payload ?? {}