rdiff-backup backs up one directory to another, possibly over a network. The target directory ends up a copy of the source directory, but extra reverse diffs are stored in a special subdirectory of that target directory, so you can still recover files los
E. Berger, S. Stern, and J. Pizzorno. 17th USENIX Symposium on Operating Systems Design and Implementation (OSDI 23), Boston, MA, USENIX Association, (July 2023)