QNAP Security VioStor NVR (Version: 4.1.2) - Manual (Page 218)

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6. The NVR displays the latest 10 remote replication records.
In the above example:
When the status is shown as ‘Failed (Remote access error)’: Check if the remote storage
device is running or the network settings are correct.
When the status is shown as ‘Failed (An internal error occurred)’: View the hard drive
status of the NVR or view the Event Logs.
Note: The time required by the NVR to replicate the data to the remote storage device
varies depending on the network environment. If the remote replication takes too long,
some recording files may be overwritten by the NVR. To avoid this, it is recommended to
refer to the status messages to analyze the time required for the remote replication and
adjust the replication schedule accordingly.