Acer Aspire 4739Z - Manual (Page 34)

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The Create Factory Default Backup dialog box opens. This dialog box tells you
the estimated size of the backup file on your USB flash drive.
3 Plug in the USB disk, then click Next. You will be shown the backup
progress on the screen.
4 Unplug the USB flash drive and mark it with a permanent marker.
Important: Write a unique, descriptive label on each backup, such
as ‘Windows Recovery Backup’ or ‘Apps/Drivers Recovery Backup’.
Make sure you keep the USB flash drive in a safe place that you
will remember.