Duplicating or copying a View
The ability to duplicate a View is already included in Version 1.6 and higher of GravityView.
The feature can be accessed from inside the Edit View screen (the "Clone View" link on the image below):

...or from the Views listing page using the "Clone" link that shows up when hovering over a View name:

Note: Users must have the copy_gravityviews capability to copy a View. By default, this is enabled for Administrator and Editor roles. Learn more about GravityView capabilities.
Can't see the Clone link?
Some duplication plugins can hide GravityView's built-in Clone feature. If you don't see the Clone link, check if you're using one of these plugins:
Yoast Duplicate Post
If you're using the Yoast Duplicate Post plugin, go to Settings → Duplicate Post and make sure "gravityview" is enabled under "Enable for these post types":

Copy & Delete Posts
If you're using the Copy & Delete Posts plugin, go to Copy & Delete Posts in the Dashboard menu and enable "Custom post types" in the "Other options" tab:

What's the difference between "Clone" and "New Draft"?
- Clone duplicates the View including its status. You'll be taken back to the All Views screen where you'll see the new View in the list.
- New Draft duplicates the View and sets the status to Draft, then takes you to the Edit View screen to edit the newly created View.