Nikon D7200 body - Manual (Page 106)

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When two memory cards are inserted in the camera, you can use
the Role played by card in Slot 2 item in the photo shooting
menu to choose the role played by the card in Slot 2. 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).
Using Two Memory Cards
A
“Backup” and “RAW Slot 1 - JPEG Slot 2”
The camera shows the number of exposures remaining on the card
with the least amount of memory. Shutter release will be disabled
when either card is full.
A
Recording Movies
When two memory cards are inserted in the camera, the slot used to
record movies can be selected using the Destination option in the
movie shooting menu (
0 273).