Uploads library on the USB drive with a nightly stable-disk copy; Topic channels resolve by name

- UPLOAD_DIR moves to the USB drive; reads fall back to UPLOAD_BACKUP_DIR on the
  ytplayer-data volume, and while the drive is offline new uploads land there
- scripts/ops/uploads-backup.sh (homelab cron, 03:30) copies both ways, never
  deletes; the server removes a deleted upload from both places
- /api/channel resolves a bare channel name ('Artist - Topic') to its id via a
  search, and the client falls back to the channel name for old saved entries

server/server.js

@@ -371,6 +371,22 @@ function channelUrlCandidates(c) {
   return out;
 }
 
+// Name → channel id: the first search hit published by a channel with exactly
+// that name (case-insensitive). "<Artist> - Topic" names come from YouTube Music.
+async function channelIdForName(name) {
+  const want = name.trim().toLowerCase();
+  const out = await runYtdlpResilient([`ytsearch10:${name}`, '--dump-json', '--flat-playlist', '--no-warnings', '--ignore-errors'], { pooled: true });
+  for (const line of out.split('\n')) {
+    try {
+      const j = JSON.parse(line);
+      const ch = String(j.channel || j.uploader || '').trim().toLowerCase();
+      const id = j.channel_id || j.uploader_id;
+      if (ch === want && /^UC[\w-]{22}$/.test(id || '')) return id;
+    } catch { /* not JSON */ }
+  }
+  return null;
+}
+
 // Resolve a channel identifier to a /videos URL yt-dlp can fetch
 function channelToUrl(c) {
   let base = c.trim();
@@ -517,6 +533,21 @@ app.get('/api/channel', async (c) => {
         if (results.length) break;
       } catch (err) { lastErr = err; }
     }
+    // A bare name ("Maverick City Music - Topic") is not a handle: find the
+    // channel id through a search, then try its uploads/home again.
+    if (!results.length && !/^(https?:|@|UC[\w-]{22}$)/.test(chan)) {
+      const id = await channelIdForName(chan).catch(() => null);
+      if (id) {
+        for (const url of channelUrlCandidates(id)) {
+          try {
+            out = await runYtdlpResilient([url, '--dump-json', '--flat-playlist', '--no-warnings', '--ignore-errors',
+              '--playlist-end', String(CHANNEL_LIMIT)], { pooled: true });
+            results = parseCards(out);
+            if (results.length) { lastErr = null; break; }
+          } catch (err) { lastErr = err; }
+        }
+      }
+    }
     if (!results.length && lastErr) throw lastErr;
     // Extract channel name + URL from the first record
     const first = results[0];
@@ -2050,6 +2081,8 @@ const uploads = registerUploadRoutes(app, {
   ffmpeg: FFMPEG,
   ffprobe: FFPROBE,
   uploadDir: UPLOAD_DIR,
+  backupDir: process.env.UPLOAD_BACKUP_DIR || null,
+  volumeMarker: process.env.UPLOAD_VOLUME_MARKER || null,
   rangeFileResponse,
   requireAdminOrToken: notes.requireAdminOrToken,
   parseLrc,