Script to 'save as' a .psb to desktop with activeDocument name + "EmergencySave" as file name

Here is a revised version with basic error checking for unsaved files:

// Save as PSB copy to source doc path, leaving the source doc open/active...
// The '_EmergencySave' suffix file will be overwritten without warning

#target photoshop

/* Start Unsaved Document Error Check - Part A: Try */
unSaved();

function unSaved() {
    try {
        activeDocument.path;
        /* Finish Unsaved Document Error Check - Part A: Try */

        /* Main Code Start */

        var d = app.activeDocument;
        var dPath = d.path;
        var dname = d.name.replace(/\.[^\.]+$/, '');
        var suffix = '_EmergencySave';

        var idsave = charIDToTypeID("save");
        var desc17 = new ActionDescriptor();
        var idAs = charIDToTypeID("As  ");
        var desc18 = new ActionDescriptor();
        var idPhteight = charIDToTypeID("Pht8");
        desc17.putObject(idAs, idPhteight, desc18);
        var idIn = charIDToTypeID("In  ");
        desc17.putPath(idIn, new File(dPath + '/' + dname + suffix + '.psb'));
        var idDocI = charIDToTypeID("DocI");
        desc17.putInteger(idDocI, 195);
        var idCpy = charIDToTypeID("Cpy ");
        desc17.putBoolean(idCpy, true);
        var idLwCs = charIDToTypeID("LwCs");
        desc17.putBoolean(idLwCs, true);
        var idsaveStage = stringIDToTypeID("saveStage");
        var idsaveStageType = stringIDToTypeID("saveStageType");
        var idsaveSucceeded = stringIDToTypeID("saveSucceeded");
        desc17.putEnumerated(idsaveStage, idsaveStageType, idsaveSucceeded);
        executeAction(idsave, desc17, DialogModes.NO);

        /* Main Code Finish */

        /* Start Unsaved Document Error Check - Part B: Catch */
    } catch (err) {
        alert('An image must be both open and saved before running this script!')
    }
}
/* Finish Unsaved Document Error Check - Part B : Catch */

A simple version of the code would just use a few variables and a change to the SL recorded save path/filename:

// Save as PSB copy to source doc path, leaving the source doc open/active...
// The '_EmergencySave' suffix file will be overwritten without warning

var d = app.activeDocument;
var dPath = d.path;
var dname = d.name.replace(/\.[^\.]+$/, '');
var suffix = '_EmergencySave';

var idsave = charIDToTypeID( "save" );
    var desc17 = new ActionDescriptor();
    var idAs = charIDToTypeID( "As  " );
    var desc18 = new ActionDescriptor();
    var idPhteight = charIDToTypeID( "Pht8" );
    desc17.putObject( idAs, idPhteight, desc18 );
    var idIn = charIDToTypeID( "In  " );
    desc17.putPath( idIn, new File( dPath + '/' + dname + suffix + '.psb' ) );
    var idDocI = charIDToTypeID( "DocI" );
    desc17.putInteger( idDocI, 195 );
    var idCpy = charIDToTypeID( "Cpy " );
    desc17.putBoolean( idCpy, true );
    var idLwCs = charIDToTypeID( "LwCs" );
    desc17.putBoolean( idLwCs, true );
    var idsaveStage = stringIDToTypeID( "saveStage" );
    var idsaveStageType = stringIDToTypeID( "saveStageType" );
    var idsaveSucceeded = stringIDToTypeID( "saveSucceeded" );
    desc17.putEnumerated( idsaveStage, idsaveStageType, idsaveSucceeded );
executeAction( idsave, desc17, DialogModes.NO );

There are two Save as steps in that Action manager scriptlistener code both save as  steps write a file name test.psb to your desktop.  If you want to save different files you need to make those step action manager code  into JavaScript functions that your Photoshopscripts  pass the file names you want yo  save to..  Or use Photoshop DOM code to save the files you want to save.  Photoshop scripting can develop output file names and types well. Action and therefore Scriptlistener has limited file naming capabilities.  You need to do some script coding. The Script listener will not add logic you need into the Photoshop steps it records.  It records hard coded steps like the Action recorder.