Many individuals are repurposing older PCs into home file servers, especially those not eligible for the Windows 11 update. This process utilizes built-in Windows features, allowing families to share files across devices without additional software, making it cost-effective since it leverages existing hardware. The setup involves four steps: preparing storage, creating a local account, creating shared folders, and accessing them from other PCs. Guidelines suggest around 500GB for photos and 1TB for videos. Compared to commercially available NAS devices, repurposing a PC incurs virtually no cost, while NAS options range from approximately ¥30,000 to ¥80,000. Performance tests show that mini PCs as file servers can achieve read speeds of about 4.8GB/s and write speeds of around 4.5GB/s on a 2.5GbE network. This method is particularly appealing for older PCs, allowing users to maximize resources rather than discard them, while also addressing the growing demand for efficient file sharing in households. Data backup and security measures are essential considerations when operating a file server.