diff --git a/backend/src/routes/admin.js b/backend/src/routes/admin.js
index b8bdc81..7b69a66 100644
--- a/backend/src/routes/admin.js
+++ b/backend/src/routes/admin.js
@@ -384,4 +384,87 @@ router.post('/cleanup-orphans', authenticate, requireAdmin, (req, res) => {
   }
 });
 
+// ── Disk-Analyse ──────────────────────────────────────────────────────────
+router.get('/disk-analysis', authenticate, requireAdmin, (req, res) => {
+  const fs   = require('fs');
+  const path = require('path');
+
+  function dirSize(dirPath) {
+    let total = 0;
+    try {
+      for (const entry of fs.readdirSync(dirPath, { withFileTypes: true })) {
+        const full = path.join(dirPath, entry.name);
+        if (entry.isDirectory()) total += dirSize(full);
+        else try { total += fs.statSync(full).size; } catch {}
+      }
+    } catch {}
+    return total;
+  }
+
+  function fmt(b) {
+    if (b < 1024) return b + ' B';
+    if (b < 1024**2) return (b/1024).toFixed(1) + ' KB';
+    if (b < 1024**3) return (b/1024**2).toFixed(1) + ' MB';
+    return (b/1024**3).toFixed(2) + ' GB';
+  }
+
+  // Alle relevanten Verzeichnisse scannen
+  const locations = [
+    '/data',
+    '/data/uploads',
+    '/tmp',
+    '/app',
+    '/root',
+    '/var/log',
+    '/var/lib/docker',
+  ];
+
+  const result = {};
+  for (const loc of locations) {
+    if (fs.existsSync(loc)) {
+      result[loc] = { raw: dirSize(loc), fmt: fmt(dirSize(loc)) };
+    }
+  }
+
+  // DB-Größe
+  const dbPath = process.env.DB_PATH || '/data/db.sqlite';
+  if (fs.existsSync(dbPath)) {
+    result['database'] = { raw: fs.statSync(dbPath).size, fmt: fmt(fs.statSync(dbPath).size) };
+  }
+
+  // /tmp Details
+  const tmpFiles = [];
+  try {
+    for (const f of fs.readdirSync('/tmp')) {
+      try {
+        const stat = fs.statSync('/tmp/' + f);
+        if (stat.size > 1024*1024) tmpFiles.push({ name: f, size: fmt(stat.size) });
+      } catch {}
+    }
+  } catch {}
+
+  // Node modules Größe
+  const nodeModules = '/app/node_modules';
+  const nodeSize = fs.existsSync(nodeModules) ? dirSize(nodeModules) : 0;
+
+  // Top 10 größte Dateien in /data
+  const bigFiles = [];
+  function scanBig(dir) {
+    try {
+      for (const entry of fs.readdirSync(dir, { withFileTypes: true })) {
+        const full = path.join(dir, entry.name);
+        if (entry.isDirectory()) scanBig(full);
+        else try {
+          const s = fs.statSync(full).size;
+          if (s > 5*1024*1024) bigFiles.push({ path: full, size: fmt(s), raw: s });
+        } catch {}
+      }
+    } catch {}
+  }
+  scanBig('/data');
+  bigFiles.sort((a,b) => b.raw - a.raw);
+
+  res.json({ locations: result, tmpFiles, nodeModulesMb: fmt(nodeSize), bigFiles: bigFiles.slice(0,20) });
+});
+
 module.exports = router;