If emunand is the main thing, then I have no problems formatting sysnand if I can restore it later assuming there'll be no problems with NNID, streetpass, or the like. Additionally, what happens if I make a backup of my emunand with all of it illicit CIAs, and then restore it to sysnand? Will they still be there? Will the restore fail and brick? Or will everything BUT the illicit CIAs be there?