Canon EOS 5D Mark IV L-series Zoom Lens Kit Owner's Manual

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You can copy the images recorded on one card (save duplicates) to the 
other card.
1
Select [Image copy].
 
Under the [31] tab, select [Image 
copy
], then press <0>.
2
Select [Sel.Image].
 
Check the copy source card’s 
number, the target card’s number and 
its remaining capacity.
 
Select [Sel.Image], then press <0>.
a
 Copying Images
3
 Copying a Single Image
Movie Files Exceeding 4 GB
 
If you are copying images between cards and the copy target card is 
formatted in FAT32 (p.74), movie files exceeding 4 GB recorded on the 
exFAT-formatted copy source card cannot be copied.
 
Movie files exceeding 4 GB can be copied between cards when both 
Card1 (f) and Card2 (g) are formatted in exFAT.
The copy source is the card selected for [Record/play] or [Playback] under 
[51: Record func+card/folder sel.].