Actually, I completely forgot the arguably easiest and lowest tech way of running FediFetcher:
GitHub Actions. These require no hardware, no installation, and no CLI at all: it’s all point and click at GitHub. Full instructions can be found in the readme:
https://github.com/nanos/FediFetcher?tab=readme-ov-file#to-run-fedifetcher-as-a-github-action
The main disadvantage is that this way you can only schedule it every 15 min - GitHub doesn’t allow more frequent schedules.