D-Link DES-1526 - Manual (Page 65)

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Backup Setting
The backup tools help you to backup the current setting of the
Switch. Once you need to backup the setting, press the
“Backup” button to save the setting.
To restore a current setting file to the device, you must specify
the backup file and press the “Restore” button to process the
setting of the recorded file.
Figure 41. Backup Setting
Note: When restoring a recorded file, the current password will not
be erased.