When you save a project in Windows Movie Maker,
it creates a project file
It's important to understand that you need this file,
but it does not actually contain any of the
video, photos, or audio that you've been working with.
Instead, the project file links to all of that content
wherever it was saved when you added it to your project.
This helps Windows Movie Maker use storage space efficiently,
but it makes it a little tricky
if you want to move your project to another computer
or make a backup copy.
The best way to make a Windows Movie Maker project
easy to copy without causing problems
is to create a folder to serve as your workspace for that project.
Store all of your video, photo, and audio files in this folder
before bringing them into Windows Movie Maker,
and save the project file here, too.
With this setup, you'll just need to copy this folder
whenever you want to make a backup.
Wherever you take your project,
everything you need will stay together,
and the project file will always stay
properly linked to all of the media you added.