Typically, you can use File > Save As to save a copy of a scene to another location on your hard drive or on your network. In this case, any files referenced in the scene (image files, geometry files, and so on) are copied over automatically.
However, you may want to copy scene files manually to an off-network location (via CD ROM or other portable medium, for example). In this situation, you also need to copy all referenced files to view the contents of the scene. These files are kept in a “companion” folder located in the same folder as the scene file.
Copy a scene to an off-network location
For example, if you are moving the file myscene.a3s, also move the folder to the same location called myscene-files. See Save your scene.