Spent a frustrating time searching, and looking at old instructions on how to enable 'php Zip' in Cpanel?
Some plugins need Archive zip to work
The Duplicator Plugin needs Archive Zip Enabled for Backup. When you click 'Create' and you get 'FAIL' and the error tells you you need to Enable PHP Extensions with EasyApache on WHM cPanel, this is what you need...
There may be others that need it too - I don't use them all as Duplicator by Snap Creek is efficient and fast.
Duplicator also needs enough memory to complete, so you can solve both of these problems all in one go.
Some shared hosts are still using default php version but if you are have the control you can change it.
( Thank you MightWeb hosting for the page that gave me this info.)
Increasing the PHP Memory Limit and Enable 'Zip'
Click "Set as current"
Set the "memory_limit" to whichever value you need it to be.Finally, click "Save".