Update Debian, Elasticsearch Zammad

Okay i’ll keep that in mind. For teaching myself i will try to update step by step but if all will not working i’ll setup a new machine and following the Backup / Restore Path described in the manual.

In the midtime i was able to Update Debian 10 to 11 with outcommend the Zammad in the ressource.list.d/zammad.list, then Update Zammad from 6.1 to 6.2 but ran into problems with postgresql 9.6 and elastic search. Which i will take care now or get one step back and:

1. Update Debian 10 to 11
2. Update Postgresql minimum to 10
3. Update Zammad
4. Update Elastic Search

Thanks for all your Help by now.