Embargo VS. private release
An embargo is a press release that will be published in the future, so you can share it privately through the draft URL.
A private release is simply a press release that does not show up in your pressroom.
How do I set an embargo?
If you're working on an exclusive, you should set an embargo: set the release date to a time in the future, then launch the campaign. it will be automatically under embargo until that time.
Learn more about how to set an embargo.
How do I backdate a news release?
It's like setting an embargo, but the date is in the past. This will change the order in your newsroom. See more info here.