Cloud Export is a tool to automatically extract your data from web applications and save it to your local file system for backup purposes, but more extensive than Google Takeout. Plans are based on http://www.dataliberation.org.
Cozy is a backup solution for Linux. It aims to be similar to Apple's Time Machine, with the difference that Cozy recognizes duplicate files and incremental backups are realized through binary diffs to save space.
rpmdiff is a utility to create a binary patch from one version of an rpm to another. This binary patch can then be distributed to end-users of a distribution who have installed the first version of the rpm and they will be upgraded to the second version.
ebsdiff creates a binary patch file using the bsdiff format. The enhancements to bsdiff are that it stores an MD5 hash of the original file (preventing accidental patching of the wrong file) and can limit the memory it uses while creating the patch file.