Give the backups plugin a settings page, and show where a snapshot is

plugins/backups/frontend/views/BackupHistory.vue

@@ -66,6 +66,16 @@
                  UNC path so the tech can open it directly. -->
             <template v-if="rev.storagebackend === 'share'">
               <code class="bh-path" :title="rev.sharepath">{{ rev.sharepath }}</code>
+              <!--
+                A copy button rather than a file:// link. Browsers block
+                navigation from an https page to file://, so a link would look
+                clickable and silently do nothing - worse than no link. Copy,
+                then paste into Explorer's address bar.
+              -->
+              <button type="button" class="bh-copy" @click="copyPath(rev.sharepath)"
+                      :title="'Copy path for Explorer'">
+                {{ copiedPath === rev.sharepath ? 'Copied' : 'Copy path' }}
+              </button>
             </template>
             <template v-else>
               <button v-for="fmt in rev.formats" :key="fmt.id"
@@ -115,6 +125,29 @@ import { useRoute, useRouter } from 'vue-router'
 import api, { settingsApi } from '@/api'
 import { formatInZone, DEFAULT_TZ } from '@/utils/datetime'
 
+const copiedPath = ref('')
+
+async function copyPath(path) {
+  if (!path) { return }
+  try {
+    await navigator.clipboard.writeText(path)
+    copiedPath.value = path
+    setTimeout(() => { copiedPath.value = '' }, 2000)
+  } catch (err) {
+    // Clipboard needs a secure context and a user gesture. Both hold here, but
+    // an older browser or a http:// instance will refuse - select the text so
+    // the tech can copy it by hand instead of getting nothing.
+    const node = document.querySelector('.bh-path')
+    if (node && window.getSelection) {
+      const range = document.createRange()
+      range.selectNodeContents(node)
+      const selection = window.getSelection()
+      selection.removeAllRanges()
+      selection.addRange(range)
+    }
+  }
+}
+
 const route = useRoute()
 const router = useRouter()
 const assetid = route.params.assetid
@@ -274,6 +307,16 @@ onMounted(async () => {
   font-size: 0.82rem;
 }
 .bh-path { word-break: break-all; color: var(--text-light); }
+/* Deliberately quiet: the path is the content, this is just the way to get it
+   into Explorer. Sits inline after the path rather than in the actions column,
+   which belongs to the revision itself. */
+.bh-copy {
+  font-size: 0.72rem; margin-left: 0.4rem; padding: 0.12rem 0.4rem;
+  border: 1px solid var(--border); background: transparent;
+  color: var(--text-light); border-radius: 3px; cursor: pointer;
+  white-space: nowrap; vertical-align: middle;
+}
+.bh-copy:hover { border-color: var(--primary); color: var(--primary); }
 .bh-actions-col { width: 22rem; }
 
 .bh-btn {