QNAP Security VioStor NVR (Version: 4.1.2) - Manual (Page 217)

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4. Configure the remote replication schedule
For example, to enable the NVR to copy the recording data automatically to the remote
storage device at 01:15 every Monday, please do the following:
Select ‘Replication Schedule’, select ‘Weekly’, enter 01 Hour: 15 minute, and select
‘Monday’.
5. Select the backup options
Select ‘Replication Now’, the NVR will back up the recording data to the remote storage
device immediately.
Select ‘Overwrite the oldest recordings when the available storage on the remote host
is less than 4GB’; the NVR will overwrite the oldest recording data when the free space
on the server is less than 4GB.
Select ‘Perform mirroring replication by deleting extra files on the remote replication’,
the NVR will synchronize the recording data between itself and the remote storage
device and delete any extra files on the remote storage device.
When the above options are all selected and remote replication is executed, the NVR will do
the following:
i. The NVR checks if there are files on the remote storage device that are different from
the local source. If yes, the differentiated files will be deleted.
ii. Next, the NVR checks the free space of remote storage device. If the free space is
larger than 4GB, the remote replication will be executed immediately.
iii. If the free space of the remote storage device is less than 4GB, the NVR will overwrite
the recording data of the oldest day and then executes the remote replication.