Have the ability to "Save As" a flow after editing instead of overwriting.
It would work the same like in any other Office product with "Save As" functionality.
Duplicate Flow is being worked on already: https://powerusers.microsoft.com/t5/Flow-Ideas/Duplicate-the-Flow/idi-p/6228
But there are situations, where you may have started editting a flow and want to "Save As" a copy of what you have done so far.
I have a situation where I need to duplicate three flows 30 times each because the flow can only look at one library each. So something as to be done to make these situations easier.