In VLP, there are two ways of backing up your reserved partition. You can save the state of the system immediately (save now) and you can save the state of the system automatically when the reservation ends (save on exit). In both cases, behind the scenes the VLP automation makes mksysb backups of AIX partitions, tarballs of Linux partitions, and backup images of IBM i reservations. I'm very fuzzy on IBM i things, so forgive/correct me if I got the IBM i-specific name for operating system backups wrong. We call operating system backups images in VLP. Once you've saved an image and your reservation that you used to save the image has ended, you can create a new reservation using that saved image. You can view your saved images by looking at the 'Images' tab in the VLP web application.
Now, I just told you how image saving/restoring is supposed to work. Please leave a comment with your image saving/restoring experiences. I'd like to know your opinions of how this works for you, how useful it is, and about any errors you have encountered.