Internal server (Home Assistant etc.): domus
External server (Nextcloud etc.): nimbus
Router/firewall: murus

I believe so—see Wake-on-LAN.

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One under-appreciated aspect of Docker is that it forces you to document all your setup steps in your dockerfile and docker-config files.

I haven’t tried it because I’ve read a lot of negative discussions of it—and because (by my understanding) the only reasonable use case would be if there were a large number of users and each user is likely to have copies of the same files but don’t want to expose their files to each other (so you can’t just manually de-dupe).