Thank you very much, Till!
Does this type of backup also include the user mailboxes? can I just copy them as well (and upon restore copy them back)?
In case of a failure, what needs to be done, to recover a master or a slave from such a backup to get the system up and running again with all services and data (incl. all mailboxes and accounts)?
I assume that I reinstall debian (Perfect Setup) with ISPC3 and then untar the files to the right locations and dump back the mysql-DB's. What more needs to be done to get up and running without severe problems? Is there any difference in restoring the master compared to a slave server?
Thanks in advance for clarifying this matter.