How to backup File?

Click Start, Run and type NTBACKUP

Select Backup tab at the top

In the left pane, scroll to the file/folder which you want to backup and put a checkmark on it.

At the bottom, mention the output filename (the backup output)

Once set, click Start Backup button in the right, and again click Start Backup in resulting dialog

Now you will need to save the backup to hard drive browse the location where you want to save backup