These ebuilds come from http://git.overlays.gentoo.org/gitweb/?p=dev/wrobel/overlay.git;a=summary.
If you have some problems, go to the official site first.
rdiff-backup : Remote incremental file backup utility; uses librsync's rdiff utility to create concise, versioned backups. ( http://www.nongnu.org/rdiff-backup/ )
Add an ebuild in portage :
The ebuild is now in the portage tree.
You can also use layman : emerge layman then layman -a wrobel
For Paludis use this rsync : rsync://gentoo.zugaina.org/wrobel-portage
If you have a problem : ycarus(-at-)zugaina.org