Due to android M new security settings. We can no longer use asus backup. Instead if you want to backup apps only then you can use es file explore that will backup the apks of app.
Unfortunately es can not backup app data
First and foremost thing to note, Keep this app to the latest updated version.
To take backup you can Open this app->Select apps/ contacts/do It later/messages(What ever among these you want to have backup of). The backup file will be saved on your SD card.