How to replace existing map or background on FSM client?
If old and new map have the same scale:then it is quite easy: In the tab "Edit", select the button "Current map settings", in the section "image" select a new map/file and open. The new map/background will be displayed and the configured sensors remain.
If old and new map have different scales:then it is better to create a new map and move all configured sensors to the new map. You can make use of the function "selection" to select multiple sensors and move them at one time.