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No. Currently, eSATA ports in NVR do not support hot swapping. So, you should connect eSATA storage to NVR before NVR is powered up. Otherwise, NVR does not recognize eSATA storage. On the other hand, if eSATA storage is swapped out while NVR is working, NVR can detect that situation and record data to another HDD.
Yes. NVR can retrieve and display the recoded audio/video data in HDD carried from another NVR.
To communicate with ATM/POS machine, NVRs have various hardware ports such as RS232C, USB, and RJ45 ethernet port, and some NVRs have RS485 port additionally.
Yes. you can use conventional analog cameras with the NVR by adding network video encoders.
The network video encoder such as DE-1101 converts an analog video signal to a network video signal, and supports the DirectIP protocol.