How to I move movies back to the cloud
How do I move a movie to the cloud and off my hard drive
If you purchased it from the iTunes store, it's already in iCloud and you can just delete it and re-download it later (see http://support.apple.com/kb/ht2519). However, be aware that it must still be in the iTunes store for you to redownload it at a future data. Also, not all studios allow their movies to be re-downloaded from iCloud so your might want to check to be sure you can do this with the movie you want to delete.