jotos‖Duplicates the selected sheet assigning a new name.
To access this command...
ebLJB‖From the menu bar:
xSd8m‖Choose Sheet - Duplicate Sheet.
4mWze‖From the sheet navigation bar:
sjnSa‖Choose Duplicate Sheet
sXy2C‖From toolbars:
vkN5N‖
G7JEf‖Duplicate Sheet
45xtZ‖The duplicated sheet inherits the name of the source sheet followed by an underscore character (_) and a number. The new name is unique within the spreadsheet document.