How big should a jump be to try a rodeo 5 and a back flip?

back flip does not need to be too big maybe something like this
1297400702beaver-creek-terrain-park-photo.jpeg
 
does it have to ba a park jump? I've never done a backie but from what I hear, if you just dig a nice poppy lip on one side of a knoll with lots of fresh snow on it, you should be good.
 
for a backflip like a big mogul jump (like an old school mogul jump) for a rodeo like a 15-20 foot table
 
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