Hey,
thanks for the suggestion. I did try and I do get an error message which says somehting about:
Could not restore
tracker-backup
gf-conf

and so on, it disappears too fast .

Still don't get the text messages back though. When I browse the file system in the messages all I can see are MMS. messaging.zip\Root\home\user\.mms\msg\
I opened the trackerbackup file which is located
\contacts.zip\Root\home\user\MyDocs\.tmp\trackerba ckup in wordpad. In there I could make out that there were sms messages but maybe that database is only for the tracker/smart search function in the phone?
Tried restoring with both contacts.zip, messaging.zip and backup.metadata but still don't get any sms or mms messages back .