What network storage is and why your old computer can do it

Network storage — or NAS, for network-attached storage — is a computer on your home network that stores files and lets other devices access them. Instead of keeping photos, documents, and backups only on your laptop or phone, you can save them to the NAS and reach them from anywhere in your house. An old computer you no longer use for everyday work can become that storage machine, as long as it can stay powered on and connected to your network.

The appeal is straightforward: you get a dedicated backup location without buying new hardware, and you can access files from multiple devices at once. Your old desktop or laptop becomes useful again instead of sitting in a closet. The tradeoff is that the computer needs to run continuously, which costs a small amount of electricity, and you need to set up the software that makes it work as storage.

This is different from cloud storage like Google Drive or OneDrive. Those services store your files on someone else's servers. A NAS keeps everything on hardware you own and control, on your own network, with no monthly subscription.

Key Takeaways

  • An old desktop or laptop can become a NAS if it has enough storage space, can stay powered on, and connects to your network via Ethernet cable.
  • Free software like TrueNAS, Openmediavault, or Synology's DSM (if your old computer is compatible) turns the machine into storage that other devices can access.
  • You will need to format or partition the hard drives you want to use for storage, which erases any existing data on those drives.
  • Once set up, you access the NAS through your network by typing an address into your file browser or mapping it as a network drive on Windows or Mac.
  • The old computer should have at least 500 GB of free storage space and a stable Ethernet connection, not Wi-Fi, for reliable performance.

Checking whether your old computer is suitable

Not every old computer works well as a NAS. The machine needs to be stable enough to run continuously without crashing, have enough storage space for the files you want to keep, and connect to your network reliably. A computer that randomly freezes or restarts is a poor choice because your files will become unavailable when it crashes.

Start by checking the hard drive space. Open File Explorer on Windows or Finder on Mac, right-click the main drive, and select Properties or Get Info. Note the total capacity and how much is currently used. For a NAS, you want at least 500 GB of free space after removing the operating system and software. If your old computer has only a 256 GB drive and Windows takes up 50 GB, you have roughly 200 GB left — enough for a small backup, but tight if you plan to store years of photos or video.

Check the network connection. Open Settings on Windows or System Preferences on Mac and look for the Ethernet port. A wired Ethernet connection is essential; Wi-Fi is too slow and unreliable for a NAS. If the computer has no Ethernet port, you can add one with a USB adapter, but built-in is better. Finally, verify the computer can stay powered on without overheating. If it shuts down after running for an hour, or if the fan runs constantly and loudly, the hardware may be too worn for continuous use.

Choosing and installing NAS software

The operating system on your old computer — Windows or Mac — is not ideal for NAS work. Instead, you replace it with software designed to manage storage and network access. The most common free options are TrueNAS Core, Openmediavault, and Synology DSM (if your hardware is on Synology's compatibility list, though Synology makes dedicated NAS boxes, not just software).

TrueNAS Core is powerful and handles large storage arrays well, but it has a steeper learning curve. Openmediavault is simpler and works on older hardware. Both are free and open-source. To install either one, you read the software as an ISO file, create a bootable USB drive using a tool like Rufus or Balena Etcher, plug the USB into your old computer, restart it, and follow the installation prompts. The installer will ask which drive to use for the operating system and which drives to use for storage.

Before you start, back up any files on the old computer that you want to keep. The installation process will erase the drive you choose for the operating system. If you have multiple drives in the computer, you can install the NAS software on one small drive and use the others for storage, which is ideal. If you have only one drive, the software and your storage will share it, which works but is less efficient.

Setting up storage drives and network access

After the NAS software is installed and running, you need to configure which drives hold your files and how other computers will reach them. Log into the NAS through a web browser on another computer on your network. You will type an address like 192.168.1.100 or truenas.local into the address bar — the exact address appears on the NAS screen or in the software's documentation.

In the web interface, you will see options to create storage pools or volumes. This is where you tell the NAS which hard drives to use and how to organize them. If you have two or more drives, you can set them up in RAID, which means the NAS writes your files to multiple drives so that if one fails, your data is not lost. RAID 1 (mirroring) copies everything to two drives. RAID 5 spreads data across three or more drives and can survive one drive failure. For a straightforward home setup with one or two drives, RAID is optional but recommended if you have the space.

Next, create user accounts and set up file sharing. Most NAS software supports SMB (Server Message Block), which is the standard Windows and Mac use to access network drives. You create a username and password, then decide which folders each user can access. Once this is done, other computers on your network can see the NAS as a shared drive and open files from it just like a local folder.

Connecting other devices to your NAS

On Windows, open File Explorer, right-click "This PC," and select "Map network drive." Enter the NAS address in the format \\192.168.1.100\foldername or \\truenas.local\foldername, enter your username and password, and click Finish. The NAS folder will now appear in File Explorer like any other drive.

On Mac, open Finder, click "Go" in the menu bar, select "Connect to Server," and type smb://192.168.1.100/foldername. Enter your credentials and click Connect. The NAS will mount on your desktop and in the Finder sidebar.

On phones and tablets, you can use apps like Solid Explorer (Android) or the Files app (iPhone and iPad) to browse the NAS if you configure it correctly in the NAS software. Some NAS software also includes its own mobile app. The exact steps depend on which software you chose, but the principle is the same: you provide the NAS address, username, and password, and the device connects to it over your home network.

Power management and keeping the NAS running

A NAS needs to stay on most of the time so you can access your files whenever you need them. However, running a computer continuously uses electricity. Most old computers draw between 30 and 100 watts when idle, depending on the age and components. Over a year, that costs roughly $35 to $120 in electricity, depending on your local rates.

To reduce power use, disable features you do not need. Turn off the monitor entirely — the NAS does not need a display once it is set up. Disable Wi-Fi and Bluetooth in the BIOS if the computer has them. Set the hard drives to spin down after 15 or 30 minutes of inactivity if the NAS software supports it. Some people put the NAS on a timer so it powers off during hours when nobody is home, though this means files are not available during those times.

Check the NAS software's dashboard regularly to make sure it is running and all drives are healthy. Most software shows drive status, temperature, and available space. If a drive starts reporting errors, replace it before it fails completely. Keep the computer in a cool, well-ventilated space — a closet or cabinet can trap heat and shorten the life of the hardware.

Backing up your NAS and planning for failure

A NAS is a backup location for your other devices, but the NAS itself needs backup too. If the hard drive fails and you have no copy of the files elsewhere, they are gone. Set up a second backup location: an external drive you connect once a week, or cloud storage for the most important files. Many NAS software packages include tools to back up to external drives or cloud services automatically.

Keep an eye on drive health. Most NAS software can send you alerts if a drive is failing or running hot. If you set up RAID, one drive can fail without losing data, but you need to replace it quickly. Buy a replacement drive before you need it, or at least know where to get one fast. An old computer is less reliable than a purpose-built NAS box, so redundancy — either RAID or external backups — is more important.

Frequently Asked Questions

Can I use an old laptop as a NAS instead of a desktop?

Yes, but it is less ideal. Laptops are designed to sleep and wake, and running one continuously can shorten battery life and overheat the battery. Desktops are built for continuous operation. If you use a laptop, keep it plugged in, remove the battery if possible, and may support good airflow around it. A laptop also has less storage space than most desktops, which limits how much you can back up.

What if my old computer does not have an Ethernet port?

You can add one with a USB Ethernet adapter, which costs $15 to $30. Plug it into a USB port and install the driver if needed. This works, but a built-in port is more reliable. Avoid Wi-Fi for a NAS — it is too slow and drops connection too often for reliable file access.

Do I need to buy new hard drives for the NAS?

Not necessarily. If your old computer already has a large hard drive, you can use it. However, if you want RAID or extra storage, you will need additional drives. Used drives from reputable sellers are cheaper than new ones, but new drives come with warranties. Budget $50 to $150 per drive depending on capacity and whether it is new or used.

Can I still use the old computer for other tasks while it is a NAS?

Technically yes, but it is not recommended. Running other programs on the NAS can slow down file access and make the machine less stable. The best setup is a dedicated NAS that does nothing but store and serve files. If you need the computer for other work, consider a purpose-built NAS box or a second old computer instead.

How do I know if a drive is failing?

The NAS software will show drive health status on its dashboard. Look for warnings about temperature, error counts, or SMART alerts. If a drive is running hotter than 50°C, making clicking or beeping sounds, or reporting read errors, replace it soon. Do not wait until it stops working completely.