QNAP Security VioStor NVR (Version: 3.3.2) - Manual (Page 201)

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7.2 Power Outage or Abnormal Shutdown
In case of power outage or improper shutdown of the server, the server will resume to the
state before it is shut down. If your server does not function properly after the restart,
please do the following:
1.
If the system configuration were lost, configure the system again.
2. If the problem persists, contact the technical support.
7.3 Hot Swapping Hard Disk Drives (RAID Configuration)
This function is not supported by the one-bay NVR models.
When a hard disk drive (HDD) of a RAID configuration fails, the failed HDD can be replaced
by a new one immediately without shutting down the server, and the recording data can be
reserved. However, if the HDD are working properly and the recording is in process, do
not hot swap the HDD to avoid damage to the HDD or recording files.
Warning: You are strongly recommended to turn OFF the server before replacing the HDD
to reduce the risk of electric shock.