Aposonic A-S1604R4 - Manual (Page 18)

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B. DATA BACKUP
The Data Backup of DVR Central Management System is to backup the data
from the connected DVR(s).
i. Under the Real-Time Image mode, please click button to
enter Download page.
ii. Click DVR drop down list to select the backup DVR and then, it
will display the DVR recorded time period on its right hand side.
iii. Select the Start and End backup time.