I run my entire home automation, DVR, streaming system, voice command system, local file backups, etc; from my self hosted setups. I also built all the systems and since it is self-hosted it all works when the internet goes out except for a couple of things I one-time read from the cloud (like guide data lookup, media data, etc).

On top of that there is value in doing it just to learn if it is anywhere near your career field, which for me it is (software & electrical engineering).