Sorry for the delay, I had problems with my domain but I switched to another one and I could successful restore the backup and login.
Now almost everything is ok but I have one more question.
After the restore I have an notfication that no email notification will be sent anymore. Where can I change this? I have searched in the whole admin area but couldn’t find anything.
This is the text I see at the default page:
Outgoing email communication has been globally disabled by an administrator. No notifications are sent by e-mail.
I tried this but I can’t see the “old” plugins which were installed. Only the current plugins.