Section utils - Debian Package: rdiff-backup

 rdiff-backup is a script that backs up one directory to another. 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 lost some time ago. The idea is to combine the best
 features of a mirror and an incremental backup. rdiff-backup also preserves
 subdirectories, symlinks, special files, permissions, uid/gid ownership (if
 it is running as root), and modification times. Finally, rdiff-backup can
 operate in a bandwidth efficient manner over a pipe, like rsync. Thus you
 can use rdiff-backup and ssh to securely back a hard drive up to a remote
 location, and only the differences will be transmitted.