So I can use an older revision and everything will be fine? The revison from 2020-07-31 19:24:21 seems to be the last with all elements.
Actually my site is still not loading in the builder, no editing of an existing old site is possible, but I can create new ones. And since the last changes the navigation is gone too, so no one can register anymore.
I made a copy of the site on a testing server. I can choose an older revision, can set the counter to a new date and make some changes. It can be published, frontpage is okay (the font is still gone...). But when I want to edit the page, I can only see Header and Footer in the builder, the content parts are gone.
Now I tried to load an old revision again, made all my changes again and exported the edited page in a text file. When I try to load it again in the builder I imported the text file to the current page. After publishing it it seems like the site can be edited again. Seems like export and import to a file could do the trick on my production site, but I´m a little scared to kill the whole site again 😃
I don´t know why, but since I have edited a copy of the site on a backup server, the page builder on my production site finally was able to load my page. I did not have to do the trick with the ex- and import to a file, the site was suddenly there. Yay, the most important changes were done.