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Thank you very much for instructions, however I decided to go with a standard way. I just copied all data from NAS230 to NAS326. I took me 15 hours thrue 1Gb network

Thank you for the quick reply. Of course I'm familiar with ssh. No problem. But I would need instructions for each step. I understand that if I mount a file system on '326 via ssh such as on '320, then I have to move one of the disks back to '320 and the system will clone it. Then I will return it to '326, I will also…