So, not hundreds of times more power hungry, but definitely 2-3x
https://www.jeffgeerling.com/blog/2021/two-tiny-dual-gigabit...
For me that would be a $49 cost per year, or a cost of little over $4 per month.
My workstation bursts to 600w+ for 15-20 minutes at a time when compiling, for comparison.
If so, you should get a LED alternative.
Also, why not use a remote server for deployment, testing, and building docker images? Most roles I have had offer such services (remote servers) as part of their costing so wouldn't cost you time, money, or effort.
I agree that having a single place to backup photos etc, is important. I use an external SSD for such a purpose as imo it's more useful to have it offline as I rarely add data and it is less likely to be comprised, e.g., it my machine was hacked.
Or they work at Google and don't really have to care.
Electricity is not particularly cheap in Switzerland, but not particularly expensive either (nothing like Germany for instance). If running a home lab is your hobby, why not. There are plenty of hobbies that are a lot more expensive.