An old MacBook can handle several jobs usually associated with a dedicated network-attached storage device, from sharing files around a home to serving a personal media library. Engadget's guide lays out a spectrum of setups, beginning with tools already built into macOS and ending with a Linux-based server managed through a web browser.
The easiest version does not require replacing the operating system. It uses the Mac as an always-available computer on the local network, with selected folders exposed to other devices. Before relying on it, the guide recommends updating the machine to the most stable version of macOS it supports, connecting it to the router over Ethernet and preventing it from going to sleep.
External storage is the more important addition. An older MacBook's internal drive may be too small for a large media library, and age increases the risk of failure. The guide therefore recommends keeping the shared data on external drives rather than treating the laptop's built-in disk as a durable archive.
Start with macOS File Sharing
Apple's File Sharing controls are under System Settings, General and Sharing. Owners can turn on File Sharing, add specific folders and decide whether each user receives read-and-write, read-only, write-only or no access. Apple also supports making a shared folder a Time Machine backup destination and limiting how much space those backups may use.
For Windows devices, Apple documents an additional SMB option. The owner enables SMB and chooses which Mac accounts can connect. Apple warns that passwords for some Windows-sharing accounts may be stored less securely, so those accounts should be disabled when they are not needed.
This built-in route is enough for ordinary file access and backups. It also leaves macOS intact, which makes it easier to maintain than a full server conversion.
Add a media library without replacing macOS
Engadget points to Plex, Kodi and Infuse for people who want the MacBook to organize and stream video. Plex can build a browsable library with artwork and metadata, while home streaming is available without the remote-access features that require payment.
The laptop's age still matters. Low-memory Macs may stutter when they have to transcode 4K video into another format on the fly. Engadget suggests streaming in the original quality where possible, which reduces that processing load but shifts the compatibility requirement to the playback device and network.
Some Intel MacBooks may also need a headless HDMI adapter to keep graphics acceleration available when no display is attached. That is a specialized fix, not a requirement for basic file sharing.
