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+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 lost some time ago. The idea is to combine the best
+features of a mirror and an incremental backup. rdiff-backup also preserves
+subdirectories, hard links, dev 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.
+
+WWW: http://rdiff-backup.stanford.edu/