Everything You Can Do to Keep an Old Computer Running
Briefly

For the best results, regardless of whether you're wiping Windows or macOS, you should take all your files and applications off the disk, then put them back on afterwards. Make sure they're somewhere safe while you're doing the reset, preferably on cloud services like OneDrive or iCloud.
Linux, a free and open-source desktop operating system, offers a wide variety of flavors known as distros. While it may lack the polish and power of Windows and macOS, certain distros run well on older computers. Popular options include Ubuntu, Linux Mint, and Zorin.
Consider turning your Windows or macOS computer into a Chromebook using ChromeOS Flex from Google, which is Linux-based. While limited to browser and web apps, it may suffice for many users' needs.
Repurposing old computers for less demanding tasks can extend their lifespan. They can serve different functions and avoid being discarded prematurely.
Read at WIRED
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