Thanks for yor response,
I already installed 2.0.18 as a temporary forum - and be sure, I've learned my updating and backup lesson
I think, we will restart with an new forum, not a restore of the old one. In my old script were some own modifications. I will leave them out, so updates will be easyer in future.
I'll try to write an "export script" for the old postings and make a kind of digest.
Still a lot of work, but the LPIBoard will go on.