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Thank you for your reply. Apologise if I have mislead you in my post. I have configure Macrium Reflect to perform backup onto an internal HDD. Then copy the backup to an external HDD.
Log files - Log file only report the status of the backup and file verification whether it is successful or unsuccessful. But it didn't say if the copying of the backup to the external drive is successful or unsuccessful. So every time before I disconnect the external HDD, I will have to make sure that the backup files are properly copied on the external HDD.
Disk I/O - The server performance degraded tremendously when Macrium Reflect start to "copy" the backup file to the external HDD. ("robocopy f: I: xxxxxx.mrimg", through command prompt). I don't know if this part of the copying process is buffered or unbuffered but it do degrade the server performance to a standstill. (I think it ran out of RAM, and it is a Windows Server 2012 issue.) For very large files, I have always prefer to use unbuffered copy. ("robocopy f: I: xxxxxx.mrimg /J", through command prompt)