A Network-Attached Storage (NAS) device is a dedicated file server connected to your home or office network, letting every device access shared storage without cloud subscriptions or vendor lock-in. The three dominant platforms — Synology DSM, QNAP QTS/QuTS hero, and TrueNAS SCALE/CORE — each represent a different philosophy: polished appliance, feature-packed hardware, and open ZFS power. Choosing the right platform matters far beyond the initial purchase because your file system, RAID type, backup tools, and container ecosystem are all tied to that decision. The single most important mental model: RAID is not a backup — it provides redundancy against drive failure but cannot protect you from ransomware, accidental deletion, or site disasters; a proper 3-2-1 strategy is always required on top.
What This Cheat Sheet Covers
This topic spans 15 focused tables and 105 indexed concepts. Below is a complete table-by-table outline of this topic, spanning foundational concepts through advanced details.
Table 1: Platform Selection — Synology vs QNAP vs TrueNAS
Picking a platform is the most consequential decision in any NAS build because software ecosystems, file systems, drive lock-in policies, and long-term upgrade paths all depend on it. The three major platforms serve different audiences and trade-offs.
| Platform | Example | Description |
|---|---|---|
DS923+, DS1522+, DS1821+ | • Most polished NAS OS • Linux-based with Btrfs/ext4 • best app ecosystem and mobile apps • easiest setup for non-technical users • premium price for hardware specs • 2025-series Plus models now require drives from Synology's compatibility list (walked back in DSM 7.3 for DS Plus series). | |
TS-464, TVS-h1288X, TS-877 | • Feature-heavy Linux NAS OS using ext4 • typically more hardware for the price than Synology • HDMI output for direct TV use • strong multimedia and virtualization • interface is more complex • past security incidents require diligent patching | |
DIY build or TrueNAS Mini X+ | • Linux-based, free, open-source • ZFS file system • best data integrity of the three • 24.10 (Electric Eel) moved from Kubernetes to Docker for Apps • steeper learning curve • no turnkey hardware — you source your own |