20 years ago, I used to have a Linux server running Slackware at home, that would wake up the two PCs we had at home to back up their data if they were turned off. If they were already turned on, they would send a WOL packet to the Linux server to turn it on in case the that server was off, and then start the backup routine. And the last one would tell the Linux server to turn-off itself. It used to work really great, good times.