This feature is only available with 15 or 50 project plans. You can subscribe or upgrade in TrackDuck billing section.
Go to TrackDuck Project Settings>Setup and press Archive Project button at the bottom of the page.
To restore the project press Show Archived button in the left side of the dashboard.
Select the the project that you want to restore and go to it’s Project Settings>Setup.
Press Restore Project button at the bottom of the page.