rocknroll (Rsync fOr baCKup and Roll) is an incremental backup maker based on rsync. It backs up a remote directory tree to a destination directory on the local host. For this backup, it manages a set of archives named tag.1, tag.2, etc. Using the famous "link-dest" option of rsync, it keeps only the difference between the different archives.
SALI (Sara Automatic Linux Installer) is a tool that allows you to install Linux on multiple machines at once. It support several protocols for downloading by way of aria2 to install a machine. For example, BitTorrent and rsync are supported. SALI originates from SystemImager and still uses the same philosophy. It is a scalable method for performing unattended installation. SALI is mostly used in cluster setups.