The recommended way to copy your course material (not including any student material) in a form you can import it into a Brightspace site in the future is to export it as a Brightspace Course Package.
NOTE: The package will be a compressed (zipped) folder of files that will not be usable except if imported back into Brightspace.
Click Continue.
Note: If you chose Select individual items to export for any component in the previous step, the Select Items page appears. This page lists all the items and any sub-items contained in the current component. Select the items you want to export and click Continue.