you can also use the dd command for that, but be aware that you need a big disk to store the image which could have a size of 500 GB
the command to use is assuming the disk you want to back up is /dev/sdb
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dd if=/dev/sdb of=/path-to/name-image
Please note that you have to replace "path-to" by the actual path where you want to store the image and "name-image" by the name you want to give to the image.
Also backing up 500 GB with dd command will take a looooong time. So be patient if you go this route.
If there is no personal data you want to keep on that disk then it is an action with not so much use. Recreating the original partition table is easy. The run the original firmware you only will need the partition I mentioned.
ps I advise to do some Internet reading on Linux and associate commands. The dd command is a powerful and as result a dangerous command. (its nick name is "dead disk" if you make a mistake in the syntax it can easily destroy all data on a disk you didn't want