What you say is correct ... and wrong as well.   -  If you use the option "-a pathname", all following characters will be read as pathname. Consequently it should be used as the last option in the command line.   -  Specifying the source client is not necessary because this is done indirectly by the ssid. The media db resolves the ssid and responds with the source client and the name of the save set, of course.  
Hello,   I want to perform a recover using ssid >recover -s -S   -a    but I want to specify another destination server where to place the restored folder. what option to use?   Thank you 
Redirect restore to a different destination server using CLI