is it possible to replace existing sqlite db file with other db file from directory in phongeap

I have one requirement to replace device database with other db file, Its like taking backup and stored directory(download/backup/appname/) or server, if we delete data or if we lost phone then I have restore data from server and replace with device database file. I am trying with code but replacing database only I am not getting.

function doBackup(){
var defered = $.Deferred();
var version = parseFloat(window.device.version);
dbPath = cordova.file.applicationStorageDirectory
  +'/app_webview/databases/file__0/1';
 if(version < 4.4) {  

  dbPath =  cordova.file.applicationStorageDirector+'/app_database
 /file__0/0000000000000001.db';
   }  
 var fileName = 'Backup_' + new Date().getTime();   

 window.requestFileSystem(LocalFileSystem.PERSISTENT, 0, function(fs) {
 fs.root.getDirectory(backupFolder, {
 create : true,  
 exclusive : false  
   }, function(dir) {      
  window.resolveLocalFileSystemURL(dbPath, function(db) {
  db.copyTo(dir, fileName, function() {
  SaveBackupData(data, GetBackupData); 
   }, onfail)
       });  
   }, onfail);
         }, onfail);

    function onfail(err){
  return defered.reject(err);
 }
    return defered.promise();
 }   

For replacing database I am trying below code

     function  copyFileToDB(fName){  
     var defered = $.Deferred();

     // request for file system
     window.requestFileSystem(LocalFileSystem.PERSISTENT, 0, function(fs){
    //request for directory Entry

var fileName = fName;

fs.root.getDirectory("Download/SMU/Backup/", { 
    create: false,
    exclusive: false
}, function(destDirectoryEntry){
 window.resolveLocalFileSystemURL(cordova.file.applicationStorageDirectory 
+"app_webview/databases/file__0/1",function(fileEntry){     
  fileEntry.copyTo(destDirectoryEntry, fileEntry.name, function(){
            alert("success - "+JSON.stringify(destDirectoryEntry));
        }, onfail);
    },onfail)
}, onfail);
     }, onfail);

    function onfail(err){
return defered.reject(err); 
     }
      return defered.promise();   
   }