All I can offer is a short python hack that is completely undokumented.
You can find it at
http://projects.gunnarwrobel.de/scripts/browser/trunk/kolabscriptand emerge it from my dev overlay (layman -a wrobel)
with
emerge kolabscript
.
Maybe it is useful, maybe not. At some point I'll continue the development of this script but for now I just rsync the resulting backup dir.