If you do a save set recover, you also need to specify the cloneid. Get that by typing:
mminfo -q "ssid=savesetid" -r "cloneid"
You can also mark the save set suspect in the media database. You can do this from the GUI (volumes --> highlight the appropriate volume and save set, then mark suspect) or the command line (nsrmm -y -o suspect -S <SSID> <cloneid>
Once that is done, NetWorker will automatically ask for the clone tape.
Good Luck!
-ag100