| Feature | Resilio Sync | Synology Drive | Google Drive / Dropbox | | :--- | :--- | :--- | :--- | | Peer-to-peer (no middleman) | ✅ Yes | ❌ No (relies on NAS) | ❌ No | | Sync speed (LAN) | Max bandwidth | Max bandwidth | Limited by cloud upload | | Selective sync | ✅ Yes | ✅ Yes | ✅ Yes | | Encrypted backup to remote NAS | ✅ Yes (encrypted key) | ❌ No | ❌ No | | Large file/folder handling (TB+) | Excellent | Slows down | Impossibly slow |