public static long backupExists(ApplicationInfo in){
		PackageInfo i = null;
		String PATH = Environment.getExternalStorageDirectory().getPath();
		try {
			i = nPManager.getPackageInfo(in.packageName, 0);
		} catch (NameNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		File file = new File(PATH + "/File Quest/AppBackup");
		if( file.exists() && new File(PATH + "/File Quest").exists()){
			for(File f:file.listFiles()){
				String out_file = nPManager.getApplicationLabel(in) + "-v"+i.versionName + ".apk";
				if(f.getName().equals(out_file)){
					return f.lastModified();
				}
			}
		}
		return 0;
	}