Apple Final Cut Pro X (10.0.9) - Manual (Page 89)

Chapter 7 Create and manage projects 89
Save projects
Final Cut Pro automatically saves all the changes you make as you work on a project, which
means you never have to save changes manually. Also, you can undo all of your changes up
to the last time you quit and reopened Final Cut Pro by choosing Edit > Undo (or pressing
Command-Z).
You can create multiple versions of a project by duplicating it. For more information about
duplicating projects, see
Organize projects in the Project Library on page 86.
Changes you make to a clip in a project do not affect the clip’s source file. Thus, if you’ve made a
lot of changes to a clip but want to start fresh, you can easily restore the clip to its original state
by adding a new copy of the clip (located in the Event Library) to your project.