Grandstream GXV3240 Administration Guide - Manual (Page 114)

Firmware Version 1.0.3.37 GXV3240 Administration Guide Page 112 of 117
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Backup Frequency. Select the day of the week for the phone to automatically start backup.
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Set Time. Select the hour and minute of the day for the phone to automatically start backup.
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Backup Item. Tap to select the applications that users would like to backup automatically.