A NAS is not a backup by itself
A network-attached storage device is useful for collecting files from the computers and phones in your home in one place. However, having multiple drives in the same NAS does not, by itself, constitute a secure backup. RAID and similar storage pools can maintain availability when a drive fails, but they do not independently protect a file that is accidentally deleted, encrypted by malware, or stolen along with the device. A secure setup should first reduce the attack surface and then create recoverable copies.
Before buying a device, research the manufacturer's security update policy, supported file systems and snapshot features, multi-factor authentication, encrypted backup export, and drive replacement procedure. Do not decide solely on the processor and number of drive bays. A product with an uncertain support period or no published security advisories is a weak foundation for a personal archive that will remain online for years.
Perform the initial setup only on the local network
Connect the NAS to the local network behind your router; do not place it in an internet-facing DMZ. Access the administration interface for the first time from your home network, then update the operating system and installed packages. Enable automatic security updates if they are available, but read the manufacturer's release notes and make a backup before major version upgrades.
Disable or rename the default administrator account and create a separate account with a unique name for administration. Use a long, unique password and, where possible, app- or hardware-key-based multi-factor authentication. Store recovery codes offline in a secure location, not on the NAS. Do not use the administrator account for everyday file access. Create a separate user for each person in the household and grant read or write access only to the folders they need.
Disable components you do not use, such as SSH, Telnet, FTP, media servers, web servers, databases, and container services. Remove old or unfamiliar packages from the app store. If you need SMB, use a current version; do not follow random “compatibility fixes” from the internet to enable legacy SMB versions. If an old television or media player works only with an insecure protocol, keeping it on a separate network or replacing it is the safer choice.
Set up controlled remote access instead of port forwarding
The most important check is whether the NAS administration interface is exposed directly to the internet. Review the DMZ, UPnP, NAT, and port-forwarding settings on your router. Disable the UPnP function that allows the NAS to open ports automatically, both on the device and on the router. QNAP's security guide specifically recommends against forwarding administration ports directly and advises using a relay connection or VPN for remote access. Merely changing the default port number provides no real protection; the service can still be scanned and discovered.
If you do not truly need access from outside your home, do not enable remote access at all. If you do need it, choose a manufacturer-provided relay service with a clear explanation of its end-to-end security or use a current VPN solution. Enable multi-factor authentication on the VPN account, restrict which devices can connect, and review connection logs regularly. Instead of exposing the entire NAS to share a file, generate links with limited validity, password protection, and restricted download permissions.
Test the setup using your phone's mobile data connection. When you turn off your home Wi-Fi, the administration screen should not be accessible through its normal web address or the public IP address. Do not give your administrator password or device information to random port-scanning websites. Look for unexpected automatic rules in the router logs and failed sign-in attempts in the NAS logs.
Keep snapshots and backups separate
Snapshots let you return quickly to the state of the file system at a particular point in time. Create an hourly or daily schedule and tier the retention period according to your capacity—for example, keep more frequent copies for the recent past and less frequent ones for older periods. Remove permission to modify and delete snapshots from everyday user accounts. Even so, remember that a snapshot on the same device is not independent protection against hardware failure, theft, fire, or compromise of the administrator account.
CISA recommends maintaining offline or isolated backups and testing restoration regularly as protection against ransomware. Store a second copy of critical folders on an encrypted USB drive that is disconnected from the NAS when the job finishes, or at a trusted remote destination that uses separate credentials. A USB drive that remains connected is not an offline backup. Cloud synchronization alone is not a backup either; it can quickly replicate deletions and encryption changes to the other side.
Once a month, choose a sample file and restore both a newer and an older version. Check that the photo opens, the archive can be extracted, and file names and dates have been preserved. Do not accept a “job completed” notification as the sole proof that a backup exists.
Prepare a short incident-response plan
If file extensions suddenly change, many files can no longer be opened, or you see an unfamiliar administrator session, first unplug the NAS network cable or block its network access through the router. Immediately running a random cleanup tool or opening connected backups could spread the damage. Disconnect affected computers from the network as well, preserve the logs, and review the manufacturer's current security advisories from another trusted device.
Before setting up a clean system, verify that the backup was not affected. After restoration, renew not only the password but also access tokens, sharing links, and multi-factor authentication registrations. A secure NAS is not a one-time configuration; it is an ongoing process of updates, permission reviews, and genuine restoration drills.