204 - Wie kann ich die Filesysteme/Laufwerke festlegen, welche ISP nutzen soll?

By explicitly specifying the mountpoints/drives in the call:

dsmc incremental -domain="/ /usr /home"

Or better by an entry in  dsm.opt:

domain / /usr /home

Without this information all local file systems without /tmp are included. The same applies to the drives and directories under Windows.