No, I'm afraid I didn't get to solve my problem. Everything is lost and I have to re-record everything now. Such a bummer. The Kemper admin stated, that there was 20 backups, but there were only 5 and none of them had the missing profile packs and rigs in them. I learned a vital lesson. Don't be naive and trust that everything will just work, because it did for 10 years or so. But thanx to EVERYONE trying to help me out. Much appreciated.
Actually, I had to edit my post-there are two types of automatic backups. One has the ending .rmbackup and contains the local library and the other one is a backup of every Profiler that was ever connected to that Rig Manager. The name of that backup contains the serial number of the Profiler. I would suggest the OP sends a copy of the backups that end with .rmbackup to the support team.