How to set time machine backup only 1 partition?

[blackwhite999]

hi guys,
i have fusion drive with 2 partition on my iMac. I'm use time machine for backup. everytime i backup with time machine will backup two partition of fusion drive. Anyone know how i can backup only one partition?
i have 1 partition for macintosh hd and 1 partition for my data. i want time machine backup only macintosh hd, pls help me!

 

[Beavix]

System Preferences → Time Machine → Options
Add the DATA partition to the Exclude list.

 

[blackwhite999]

Thank you so much!
i have done

System Preferences → Time Machine → Options
Add the DATA partition to the Exclude list.