HT201250 reformat FAT-formatted drive in Mac OS Extended

I am using an external disc to backup my whole Mac, using Time Machine. I want to include in the back-up another external hard dirk INTENSO where I am already saving lots of pictures. Time Machine tells me that I can not include it in the back-ups because it is formatted for Windows (FAT32).
How can I format it for Mac? I know I would delete all the existing files so I need to make firstly a copy of them. THANKS

Open Disk Utility, and follow the sequence in the pictures below. Please note that step 2 is in the last picture.

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