Are you running this script on the server you’re backing up? If so, powering off the server would stop the script and you would just end up with a powered off droplet. If you run it from a separate server or your home computer it should work properly.

I should also note that we made some recent changes that make this script overly complicated. It is no longer required to power off a server to create a snasphot so I would recommend updating this script to remove the need to power off and power back on.