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If you use windows you can use this script to make backup versions of your install photoshop versions user preferences.  The script will not work on a mac. "BackupPhotoshopPreferences.jsx"

var makeFolder =  new Folder('~/Desktop/PsPreferences');
makeFolder.create(); // make sure the folder 
var makeFolder = new Folder(makeFolder + "/" + app.version);					
makeFolder.create(); // make sure the folder 
var now = timeStamp();
var makeFolder = new Folder(makeFolder + "/" + now );					
makeFolder.create(); // make sure the folder 

var Preferences =  new Folder(app.preferencesFolder);

var current = convertPath(Preferences);
var backup = convertPath(makeFolder);
//alert('Copy "' + current + '" "'  + backup + '"'); 
var batch_file = new File(Folder.temp + "/CpyPsPref.bat");
batch_file.open("w");
batch_file.write('Copy "' + current + '" "'  + backup + '"'); 
batch_file.close;
batch_file.execute();
alert("PS " + app.version + " Preferences " + now);

function  convertPath(location) {
	str = String(location);
	if (str.indexOf("~") != -1 ) str = str.substr(str.indexOf("~") + 1 ,);
	while (str.indexOf("%20") != -1 ) {	
		before = str.substr(0, str.indexOf("%20")) + " ";
		after = str.substr(str.indexOf("%20") + 3 ,);
		str = before + after;
	}
 	var path = "c:\\Users\\" +$.getenv("username");
	while (str.indexOf("/") != -1 ) {	
		path = path + str.substr(0, str.indexOf("/")) + "\\";
		str = str.substr(str.indexOf("/") + 1 ,);
	}
	return path + str;
}

function timeStamp(){

	// Get the time and format it
	var digital = new Date();
	var hours = digital.getHours();
	var minutes = digital.getMinutes();
	var seconds = digital.getSeconds();
	var amOrPm = "AM";
	if (hours > 11) amOrPm = "PM";
	if (hours > 12) hours = hours - 12;
	if (hours == 0) hours = 12;
	if (minutes <= 9) minutes = "0" + minutes;
	if (seconds <= 9) seconds = "0" + seconds;

	// Get the date and format it
	var date = new Date();
	var d  = date.getDate();
	var day = (d < 10) ? '0' + d : d;
	var m = date.getMonth() + 1;
	var month = (m < 10) ? '0' + m : m;
	var yy = date.getYear();
	var year = (yy < 1000) ? yy + 1900 : yy;
	
	// create a variable with the fully formatted the time and date
	// todaysDate = hours + ":" + minutes + ":" + seconds + " " + amOrPm + " - " + day + "/" + month + "/" + year;
	// todaysDate = hours + ":" + minutes + ":" + seconds + " " + amOrPm + " - " + month + "/" + day + "/" + year;

	MonthNames = new Array("January","February","March","April","May","June","July","August","September","October","November","December");

	todaysDate = hours + "-" + minutes + "-" + seconds + " " + amOrPm + " " + MonthNames[date.getMonth()] + " " + date.getDate() + ", " + year;

        return todaysDate;
}