system/rdiff-backup: Initial import

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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, modification times,
+extended attributes, acls, and resource forks. Also, 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. Finally, rdiff-backup is easy to use and settings
+have sensical defaults.
+
+Dependencies: librsync (from slackbuilds.org)
+