In this backup, it is not the individual files that are backed up but entire images of the hard drives of the computer that is backed up.  With the full PC backup, you can restore the computer hard drives to its exact state when the backup was done. With the Full PC backup, not only can the work documents, picture, videos and audio files be restored but the operating system, hard ware drivers, system files, registry, programs, emails etc can also be restored.

Full Computer (Image) Backup