for Myriad v3 it's pretty simple - you should look into the file locations and settings menus - make a note (or screenshot) the settings that relate to soundcard etc.
If you data and audiowalls are in a main folder i.e. \\myriadserver\psquared\audiowall & \\myriadserver\psquared\Directory etc - then you just need to copy the entire "psquared" folder. REMEMBER if any Myriad on your network is running, you will not be able to copy open files, so you need a bit of software, or a quick google into copying open files via the command line.
So once you have copied the data, go into Myriad, into the settings and License Details section - make a note of the License Name (you'll need this later) - if you are connected to the internet you can simply press the button to "release" the license code.
Copy the data onto the new machine, Install the application, run though the license wizard putting in the same License Name and press "set", you should be able then to click on the "globe" icon to retrieve the details and license on-line.
You may not be able to do this if, your personel details are out of date on our systems at this end - please call the office during normal hours and if you are on the Authorised List we will be able to issue a code manually (if the internet method doesn't work).
Broadcast Radio Ltd