Buffalo HD-PHS40U2 User Manual page 4

MiniStation Disk Backup
Schedule is an optional setting that can be used to make the
backups occur on a regular basis. Press the Change button
inside the Schedule box to set up the schedule.
Schedule has four options. Unless you choose Do not
schedule backup, you'll need to enter a time for the backup.
Use the pull down menus to select the appropriate settings and
press the OK button.
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