Wiki move 10.10 to 10.10

Hello there

we need to move a customers wiki from an old xserve to a new macmini server with os x yosemite. The following steps I did succsefully:

1. Between step: Migrate from the old 10.6 server to mountain Lion Server (10.8) in a virtual machine

2. Upgrade the OS of the virtual machine to 10.10 with app store

3. So now we have a virtual machine in our lap with server app and a correct running Wiki. Now we should move the Wiki to customers site.

So I tried to export the wiki settings with the command sudo wikiadmin export -name Bildung -path /tmp/wikiexport

The prceedure needs only 1 second of time and I can see in the terminal:

2015-05-26 07:25:08.920 wikiadmin[44844:860242] ==> Exporting...

2015-05-26 07:25:08.930 wikiadmin[44844:860242] ==> Export completed...

the export directory is empty.

Has anybody an idea what can be the problem there? Or is there another way to move a wiki from one 10.10 server to antoher?

Thanks in advance and best regards

Juerg