Nikon D7200 body - Manual (Page 35)

35 Menu Guide
Choose the role played by the card in Slot 2 when two memory
cards are inserted in the camera.
Choose from Overflow (the card in Slot 2 is used only when the
card in Slot 1 is full), Backup (each picture is recorded twice,
once to the card in Slot 1 and again to the card in Slot 2), and
RAW Slot 1 - JPEG Slot 2 (as for Backup, except that the NEF/
RAW copies of photos recorded at settings of NEF/RAW + JPEG
are recorded only to the card in Slot 1 and the JPEG copies only
to the card in Slot 2).
Role Played by Card in Slot 2
G button
➜ C photo shooting menu