Exporting a Realtime canvas is as simple as copying and moving a file. The default storage location for Realtime canvases on Windows is C:\Program Files (x86)\Xima Software\Chronicall\tomcat\webapps\ROOT\resources\binary. Each canvas file will be named according to the order in which they were created, starting with canvas0.bin. This is also the order they are shown in when you open Realtime Stats.
Copy the appropriate file and move it wherever necessary. To import the wallboard into another instance of Chronicall, simply place the file in the \tomcat\webapps\ROOT\resources\binary folder and, if necessary, rename it to avoid having the same filename as an existing canvas. Once this is done, restart the Chronicall service.