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You can turn a spare computer into a useful home server, but “any old PC” is too broad: the right project depends on its processor, memory, storage, and the work you expect it to do. Pi-hole is a light starting point if you are comfortable changing DNS settings; Home Assistant and Jellyfin offer other approachable uses. Nextcloud and Immich need more resources and upkeep, while a local backup target is a practical way to learn server basics without entrusting unique files to a new service.
Check the computer before choosing a project
Start by identifying the CPU model, installed RAM, available disk space, operating system, and whether the machine can stay connected to your network. Also consider the condition of its storage: an old computer with a failing drive is a poor home for the only copy of important files.
The requirements below are not performance guarantees. Actual results depend on the machine and workload, and the available documentation does not provide comparable benchmarks, power measurements, setup-time estimates, or quantified security-risk rankings for these six projects.
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1Clear out junk files and repair common Windows errors2Scan for outdated or missing drivers - takes under a minute3Repair Windows errors before they cause bigger problems1. Pi-hole: filter DNS requests on your home network
Pi-hole is a lightweight DNS filtering service, and its official prerequisites list 512 MB of RAM and 2 GB of free space for supported x86_64 systems. It is not limited to Raspberry Pi hardware. Check the current Pi-hole prerequisites before installing.
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- 12th Intel Alder Lake N95 Processor – The GMKtec G3 S Mini PC is powered by the 12th Gen Intel N95 processor with 4 cores, 4 threads, 6MB cache and a burst frequency up to 3.4GHz. Compared with N100/N5105/N5100/N5095, the N95 delivers up to 36% overall performance improvement. Perfect for routine tasks, office work, and home entertainment, this compact mini desktop is more convenient than traditional bulky PCs.
- 8GB RAM & 256GB SSD Storage – Pre-installed with 8GB DDR4 memory and a fast 256GB M.2 2242 SSD, the G3 S mini desktop offers quicker startup, smoother multitasking, and faster file transfers. Enjoy seamless performance whether you’re working on multiple applications, browsing, or streaming content.
- Rich Interfaces & Connectivity – The G3 S mini computer comes equipped with USB 3.2 (up to 10Gbps), dual HDMI 2.0 (4K@60Hz), and a 3.5mm audio jack. With support for WiFi 5, Bluetooth 5.0, and Gigabit Ethernet (RJ45 1000MbE), it connects easily with monitors, projectors, printers, office equipment, and other peripherals, making it versatile for both home and business use.
- Dual 4K Display Support – Featuring upgraded Intel UHD Graphics (up to 1000MHz), the G3 S supports 4K video playback and AV1 decoding for a smooth viewing experience. With dual HDMI outputs, you can connect two 4K@60Hz displays simultaneously, enabling efficient multitasking for work and entertainment.
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What it takes to use it across the network
Give the server a stable network address, either by setting a static IP or creating a DHCP reservation. To use Pi-hole for network-wide DNS filtering, configure the router or individual clients to use it as their DNS resolver; installation alone does not change where devices send DNS requests. The official Pi-hole setup documentation covers the installation and configuration steps.
Who should start here
Choose Pi-hole if you want a modest first project and are comfortable changing DNS settings and troubleshooting connectivity if a configuration change causes problems. DNS filtering can block many domain-based ads and trackers, but it does not block every ad or tracking method.
2. Home Assistant: bring smart-home devices together
Home Assistant can run on existing x86-64 hardware, including a spare desktop or laptop. Depending on how you want to manage it, installation options include Home Assistant OS, a container, or a virtual machine. Its installation guide explains the available approaches, and its hardware FAQ also identifies an existing mini PC, NUC, Raspberry Pi, or VM as possible ways to run it.
Plan around the devices you own
A radio dongle is optional, not a universal requirement. You may need one if the smart-home devices you want to connect use a radio protocol that your computer does not already support. Check the protocols and integrations your devices need before buying hardware.
Rank #2
- [15W Ryzen 7 Agentic PC for Everyday Workflows] Powered by the AMD Ryzen 7 7730U processor (8 Cores, 16 Threads), the GEEKOM A5 is built for sustained productivity. It doubles as your cloud-native Agentic AI assistant, seamlessly hosting cloud AI tasks, automating office workflows, and handling intelligent document summarization without complex local deployment. Smoothly manage Microsoft Office, dozens of browser tabs, heavy Excel spreadsheets, and remote learning throughout your workday.
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- [Multi-Display Connectivity for Maximum Productivity] Create a complete workstation with support for up to four displays through Dual HDMI and Dual USB-C ports, including up to 8K output via USB-C. Stay connected with Wi-Fi 6, Bluetooth 5.4, a 2.5GbE LAN port, SD card reader, and multiple USB ports for fast networking, efficient multitasking, and seamless connectivity across all your devices.
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- 🏢[Business-Ready, Compact & Efficient] Pre-installed OS, the GEEKOM A5 supports Wake-on-LAN, Scheduled Power On, and Group Policy, making deployment and remote management simple for businesses. Its ultra-compact 0.6L design fits neatly behind monitors or into space-limited workstations while delivering excellent power efficiency for home offices, front desks, and commercial environments.
Choose an installation style you can maintain
Home Assistant OS is a dedicated appliance-style option; containers and virtual machines can suit people who already manage those environments. The best fit depends on whether you want the home-automation system to be the computer’s main job or one service among others.
3. Jellyfin: organize and stream a personal media library
Jellyfin provides installation routes for common desktop systems, Linux, and containers; choose from its current installation documentation based on the operating system and setup you plan to maintain.
Check CPU support, especially on older hardware
For Jellyfin 10.11, the project says x86 CPUs need SSE4.1 support, which it identifies as present in Intel Penryn-generation processors and later and AMD Bulldozer-generation processors and later. Its hardware selection guide explains the relevant hardware considerations. Verify your processor rather than assuming that an old computer is compatible.
Direct playback is different from transcoding
When a client can play a file in its existing format, the server may be able to direct-play it. If the client needs a different format, resolution, or bitrate, Jellyfin may need to transcode it. Transcoding can demand substantially more compute or compatible hardware acceleration, so a machine that handles direct playback may struggle with simultaneous or demanding conversions.
Rank #3
- 【AMD Ryzen 3 5300U CPU: Outperforms N150 & 3500U】 BOSGAME E5 mini PC is powered by the TSMC 7nm FinFET architecture AMD Ryzen 3 5300U processor (4 Cores, 8 Threads, up to 3.8GHz boost, 6MB total cache). Compared to low-end Intel N150 or 3500U chips which only have 4 single threads and throttle under load, the 5300U delivers over 30% faster multi-core speed. Run 30+ browser tabs, large Excel sheets, and Zoom meetings simultaneously without system lag.
- 【8GB DDR4 RAM & 256GB NVMe SSD Storage】 Installed with high-speed 8GB DDR4 dual-channel memory and a fast 256GB M.2 2280 SSD, eliminating slow boot times and application loading delays. To accommodate growing data requirements, the upgradeable hardware design features dual SODIMM slots that allow you to expand memory up to 64GB RAM, ensuring smooth operation during heavy multitasking.
- 【High-Capacity Dual M.2 SSD Storage Expansion】 Never worry about running out of space for your business files. In addition to the pre-installed 256GB system drive, the motherboard houses an extra empty internal M.2 2280 NVMe PCIe 3.0 slot. This allows you to easily add a second solid-state drive for up to an additional 2TB of storage capacity (upgrades not included) without needing to remove or reinstall the original operating system.
- 【Radeon 6-Core Graphics & Triple 4K Displays】 Integrated with official AMD Radeon Graphics (6 Graphics Cores, 1500 MHz frequency) for casual gaming, photo editing, and crisp 4K media decoding. Featuring 1x HDMI 2.0 port, 1x DisplayPort, and 1x Full-Function Type-C port, the E5 outputs true 4K@60Hz resolution to three monitors at once. This multi-screen setup eliminates constant window-switching for traders, programmers, and office workers.
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4. Nextcloud: host files and synchronization
Nextcloud is a fuller server stack, not just a lightweight file-sharing app. Its server requirements specify a supported 64-bit software stack, including a database, web server, and PHP runtime. The Nextcloud system requirements give the supported components and memory guidance.
Account for workload and memory
Nextcloud’s manual gives 128 MB of RAM per process as a minimum and 512 MB as its recommendation. Those figures do not mean the whole server will run well with only that amount: memory use varies with users, installed apps, file count, and activity. A small personal setup and a busy multi-user server are different workloads.
Use current deployment guidance
The administration manual lists automated deployment routes such as Nextcloud AIO and a community Snap package. Consult the current Nextcloud installation guidance rather than following an old tutorial that may describe outdated dependencies or steps.
5. Immich: build a self-hosted photo library
Immich is designed for a self-hosted photo library and phone uploads. Its current requirements list a minimum of 6 GB of RAM and 2 CPU cores, with 8 GB of RAM and 4 cores recommended. The Immich requirements page also says systems with 4 GB of RAM can run it with machine-learning features disabled. Its quick start requires Docker; see the Immich quick-start guide.
Rank #4
- This Certified Refurbished product is tested and certified to look and work like new. The refurbishing process includes functionality testing, basic cleaning, inspection, and repackaging. The product ships with all relevant accessories, a minimum 90-day warranty, and may arrive in a generic box. Only select sellers who maintain a high-performance bar may offer Certified Refurbished products on Amazon.com.
- Dell OptiPlex 7050 Micro Computer, Intel Quad Core i5-6500T up to 3.1GHz, 16G DDR4, 256G SSD.
- Includes: USB Keyboard & Mouse, Microsoft office 30 days free trail.
- Ports: 1 x RJ-45, 1 x HDMI, 1 x DP, 6 x USB 3.0.
- 4K Support: Support 4K (3840x2160) Dual display, makes it easy to connect two monitors at the same time, and you can expand working Windows, mirror content, or expand a single window across multiple monitors.
Leave room for generated media
Immich says thumbnails and transcoded video increase library size by 10–20% on average. Keep that additional storage in mind when planning disk space, alongside the original photos and videos.
Keep a separate backup
A photo library hosted on one old PC is still just one copy. Before moving irreplaceable images into a new setup, make sure you have an independent copy and a way to restore it.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.6. A local backup target: practice copying and restoring files
Use the spare PC, or a separate drive connected to it, as a destination for scheduled copies from another device. This is a general practice project rather than a recommendation for a particular backup application: the available documentation here does not establish or vet a specific backup service.
Quick wins for a faster PC:
Repair Windows errors before they cause bigger problemsFix Now →Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Practice the whole backup cycle
- Schedule copies from a separate computer or storage device.
- Restore a sample file and verify that it works; a completed copy job alone does not prove that recovery will work.
- Keep another copy independent of the server. For important data, do not rely on one old PC or one disk.
An external USB drive can be one way to hold a separate copy, but it is not a complete backup strategy by itself. What matters is having an independent copy and checking that restoration works.
How to choose your first project
| Project | Official hardware information | Main setup consideration | Workload or failure concern |
|---|---|---|---|
| Pi-hole | 512 MB RAM, 2 GB free space, and x86_64 support listed in Pi-hole prerequisites. | Stable IP address or DHCP reservation; configure router or clients to use it for DNS. | A DNS misconfiguration can disrupt name resolution for affected clients; it will not block every ad or tracker. |
| Home Assistant | Can run on x86-64 hardware; no comparable minimum RAM figure is established here. | Choose OS, container, or VM; add a radio dongle only if the devices require it. | Device and protocol compatibility depends on the intended smart-home setup. |
| Jellyfin | Version 10.11 requires SSE4.1 on x86; the hardware guide identifies CPU-generation examples. | Install for the chosen desktop OS, Linux system, or container. | Direct playback is less demanding than transcoding, which can need more compute or hardware acceleration. |
| Nextcloud | Supported 64-bit stack with database, web server, and PHP; manual gives 128 MB RAM per process minimum and 512 MB recommendation. | Deploy and maintain the required server components using current guidance. | Memory needs vary with users, apps, files, and activity. |
| Immich | 6 GB RAM and 2 cores minimum; 8 GB and 4 cores recommended. The 4 GB option requires disabling machine learning. | Quick start requires Docker. | Thumbnails and transcoded video add 10–20% to library size on average; retain a separate backup. |
| Local backup target | No specific minimum or application established here. | Schedule copies, test restores, and keep another independent copy. | A single old PC or disk should not hold the only copy of irreplaceable data. |
For a first server project, Pi-hole is a reasonable starting point if you can manage DNS changes. Home Assistant or Jellyfin are alternatives when their purpose better matches your interests and hardware. Treat Nextcloud and Immich as later projects if you are still learning routine updates and backups, especially before putting unique files or photos on them.
What an old PC does not tell you
The label “old” does not reveal whether the machine meets a service’s CPU requirements, has enough memory, or has healthy storage. Nor does the documentation establish how much electricity a specific system will use or how well it will perform with your files and devices. Check the actual hardware and intended workload before choosing, and keep recovery copies separate from services that hold important data.
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