There are some scenarios, when you are creating similar automations or creating the same automation on many boards, where copying an automation will save you a ton of time.

Go Automations on the board

For the automation you want to copy, select Copy from the menu

Then select the board where you want the copy to go (the default is the board you are on)

Note: The new automation created from the copy will be "off" by default. You should double check the automations set-up and turn it on when you're ready.