Acer W3-810P - Manual (Page 55)

Recovery - 55
Make sure Copy contents from the recovery partition to the recovery
drive is selected. This provides the most complete and safest recovery
backup.
3. Plug in the USB drive then click Next.
• Make sure your USB drive has enough capacity before continuing.
The recovery backup requires at least 16 GB of storage
4. You will be shown the backup progress on the screen.
5. Follow the process until it completes.
6. After creating the recovery backup, you can choose to delete the
recovery information on your computer. If you delete this information,
you can only use the USB recovery backup to restore your computer, if
you lose or erase the USB drive, you cannot restore your computer.