Clone map software on micro SD?

I have a handheld GPS when I’m out in the sticks. I bought some map software called backroad maps and I’d like to make a copy of it and use the copy in my GPS.

I had some batteries go bad and they corroded one side of my GPS, LUCKILY it never got onto my card and it still works BUT I don’t want to take a chance. I’d like to clone the card and then keep the original safe. Any idea how I can do this?

I only have one SD card reader on my laptop but I do have a USB to SD adapter so I can technically use both at the same time OR copy the image to my hard drive, whichever is a better idea.