don't be rude 
the new back-up method from cwm recovery split the image in two parts first is the common for each back-up the second is the variable files which developers change in update, this method is maybe good if you flash rom"X.v1" then "X.v2" and so on, the common part is the same and only the modified part are backed-up, you got an huge first nandroid (in my case more than 1Gb) and then smaller one
previous method backed up everything, about same size for each back-up, this is convenient if you switch between roms
but, AFAIK, and having issue with 6.0 recovery I switched back to 5 non touch, the new one never run good on my NS and I find really odd the new method
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