Turn a PC into a NAS with TrueNAS: Guide and Data-Safety Checklist

Quick answer: You can turn an x86-64 PC into a NAS with a storage OS like TrueNAS (or OpenMediaVault). Note this does NOT turn the PC into a Synology device and cannot run official DSM. Safe steps: (1) back up all existing data on the PC first — installing TrueNAS erases disks; (2) use a separate boot drive apart from the data disks; (3) download TrueNAS, make an install USB with Rufus/balenaEtcher, boot and pick the correct target disk; (4) after install, open the web UI and create a ZFS pool, datasets, user accounts and SMB shares; (5) enable snapshots and configure off-box backup. Businesses needing SLA/monitoring should consider a dedicated NAS (Synology/QNAP).

PC-as-NAS vs a dedicated NAS appliance

“NAS” is a role — providing storage over the network — not necessarily a specific box. A PC running TrueNAS can serve SMB/NFS shares, permissions and snapshots, but you take on hardware compatibility, power draw, noise and spare parts. A Synology/QNAP appliance is simpler and quieter with vendor support.

Data-safety checklist (do this first)

• Only use a test PC or one you can wipe after moving data off.
• Back up any production data to an independent copy before starting.
• If the PC holds the only copy of important data, stop and copy it elsewhere first.
• Confirm the hardware (ECC RAM is ideal for ZFS; enough SATA ports; a reliable PSU).

Install TrueNAS

1. Download TrueNAS (CORE or SCALE) and write it to a USB with Rufus/balenaEtcher.
2. Connect a separate small boot device and your data disks.
3. Boot from the USB and install TrueNAS to the boot device — double-check the disk selection.
4. Reboot and note the web UI IP address.

Configure storage and shares

1. Create a pool (ZFS) with a sensible layout (mirror/RAIDZ for redundancy).
2. Create datasets for each share.
3. Add users/groups and permissions.
4. Create SMB/NFS shares and connect clients.
5. Enable snapshots and set up backup/replication to another device.

When to choose an appliance instead

For business-critical storage needing SLA, monitoring and support, a dedicated NAS or a designed central-storage solution is usually the better fit than a self-built PC NAS.