Dahua HCVR8204A-S3, User Manual

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In the main menu, from Main menu->Setting->Storage->HDD Manager, you can set
one or more disk(s) as redundant. You can select from the dropdown list. System
auto overwrites old files once hard disk is full.
Please note only read/write disk or read-only disk can backup file and support file
search function, so you need to set at least one read-write disk otherwise you cannot
record video.
Note
About redundancy setup:

If current channel is not recording, current setup gets activated when the channel
begin recording the next time.

If current channel is recording now, current setup will get activated right away, the
current file will be packet and form a file, then system begins recording as you have
just set.
After you completed all the setups, please click Save button.
Playback or search in the redundant disk.
There are two ways for you to playback or search in the redundant disk.

Set redundant disk(s) as read-only disk or read-write disk (Main
menu->Setting->Storage->HDD Manager)). System needs to reboot to get setup
activated. Now you can search or playback file in redundant disk.

Dismantle the disk and play it in another PC.
4.2 Preview
4.2.1 Preview Window
After you logged in, the system is in live viewing mode. See Figure 4-50. It is to display
system date, time, channel name and window No. If you want to change system date
and time, please refer to general settings (Main Menu->Setting->System->General). If
you want to modify the channel name, please refer to the display settings (Main
Menu->Camera->CAM name)