But I found out, that Opera deletes the Extensions folder inside my profile folder each time I launch Opera.
That is unacceptable. What's the point of backing up all profile, cache and executable folders if opera wont even recognize them? Not only that but also delete your information.
I had to manually install 38 extensions like you, one by one. And I dont even remember which ones I had deactivated.
Also the opened tabs didnt got saved so I had to manually rename the sessions and tabs files inside the Sessions folder.
Then even if your computer has the same name than your old one, a new speed dial folder gets created with a duplicated name.
Thankfully my second opera installation is opera portable and all these settings got saved without touching anything.