A: You can export a flow as a package and import it into a different environment, or use it to restore the in the same environment at a later point in time.

C: The ability to make a copy of your flow is often useful when you want to create a flow similar to something you've already created. Or, if you want to maintain a draft of your working flow as you work on adding more functionality.

Here's how:

Go to your My flows page. Click on the More (…) menu item next to the flow that you want to create a copy of. Click on the Save As command.