Aposonic A-S0404R13A - Manual (Page 37)

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4.3 BACKUP
After click “BACKUP” button, use the drop down list to select “Media Device”
which has USB and DVD-RW (in 08CH and 16CH models) two options.
Time to Set Backup
Use ◄ or ► to select the start and end time of backup. Then, click Backup button
to start backup.
4.4 SYSTEM LOG
System log reserves all the logs. The maximum number of reserved log is 2000.
Moreover, click “Log Filter” button can select which sort of logs that will show in
the system log page.
Click to exit the Playback Setup page.