Backup was available. But when Plesk is broken as well. Things suddenly become much harder for non server guys.
It was really the simplest to setup a second server and use the backup there. That gave us a good overwiew, what will be lost, what will be existent. For example all images I could easily download, so I had no data loss there.
Normally I would have resetted my main server afterwards and use it again. But this time I decided to use "the chance" and uprade my server. We have now this one https://www.hetzner.com/dedicated-rootserver/ax101 π€―Massively oversized for a normal TB shop. But we will have over 100k products, own crm and erp modules. So we are set for the future π