Default Gonna install new Rom, where to back up files so I don't lose them?

Installing a new Rom tomorrow, I don't want to lose my game data or pics. Where can I move them on my phone during the wipe and install so I don't lose them?

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"Do not conform to the pattern of this world, but be transformed by the renewing of your mind. Then you will be able to test and approve what God’s will is—his good, pleasing and perfect will. Romans 12:2