We (three owners of our plane) use two or sometimes three different SD cards.... So we can each take one home and update it before flying.
Inevitably they get a bit out of synch. Maybe one falls behind in charts, or the custom instruments , and waypoints, and flight planns, one of us configured in one card last flight isn't there when he flys next week.
Be nice if after iFly connect finishes updating a card it would ask "Do you have another SD card from this iFly that you'd like to sync to this one. And did so intelligently after I said "yes."
Alex