Hello Ovidiu,
sorry for replying so late. But I wanted to try some other steps before. And I came to the conclusion: Restoring in xampp on my pc using Xcloner or JoomlaCloner doesnt work for me at the moment. As you probably know xampp in its default configuration just simulates a server. To make it safe as a real server (so that you could have a remote look at it) would have meant to me as a non professional a lot of hard trying I think. So I created a subdomain for testing issues and (I almost couldnt believe it) restoring went well and easy.
Thanks a lot so far
Martin