Hi,
 
> Since the morning of 3/25 my sup to the german mirror on 
> wipux2.wifo,uni-mannheim.de deletes virtually every file in my source tree and 
> restores only parts of it, esp. usr.bin is empty...

You are not the only one who had this problem :(

> Is this a general SUP-Problem or just related to wipux2?

It was a problem on wipux2, but this should be gone away, I tried it a few
moments ago after I got an email that it should work and yes it works now.

Bernd