Asus X450JF - Manual (Page 92)

 Notebook PC E-Manual
. In the Advanced options screen, select System
Image Recovery.
. Choose an account you would like to recover using
a system image file.
. Type your account password then tap Continue.
. Select Use the latest available system image
(recommended), then tap Next. You can also
choose Select a system image if your system
image is in an external device or DVD.
8. Follow the succeeding steps to complete the
system image recovery procedure.
NOTE: We strongly recommend that you regularly backup
your system to prevent data loss in case your Notebook
PC stops working.