Acer Aspire S5-391 User Manual page 37

The Create Factory Default Backup dialog box opens.
This dialog box tells you the estimated size of the backup file.
• If you are using optical discs, it will also show the number of blank,
recordable discs you will need to complete the recovery discs. Make
sure that you have the required number of identical, blank discs.
• If you are using a USB disk, make sure is has enough capacity before
continuing.
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