the "dd" command is already built into Mint - dd command to back up your HD example:
dd if=/dev/sda of=/dev/sdb
In Linux, the abbreviation stands for “Data Duplicator” or “Disk Dump” or a variety of other alliterations depending on your source. It even earned the nickname “data destroyer”
Also here - https://www.geeksforgeeks.org/dd-command-linux/
What happens is that I don't like "dd" command, I have used it many times, but I prefer handel it by graphic mode, if I can find one. Every time I use dd to clone any HDD's, when the task reaches de 88 %, it shows error. Of course I use a bigger size HDD for the receiver HHD, but always happens the same, error. I have tried some Windows software, it happens the same, I have changed the HDD, and same result. I was thinking of DiskDump as a way out. Well, thanks anyway, I will keep on trying. Thanks a lot Lord Boltar.