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Some things in woodworking are just not that exciting and cutting backs and bottoms probably falls quite nicely in that category. So why am I even covering it, because I have had a number of emails and comments from subscribers on the topic and I know if a few people comment on something, there are probably hundreds who also have questions but just don't ask the questions.
So, cutting backs on cabinets or bottoms for boxes is really exactly the same thing. All you are doing is cutting rabbet around insides of the cabinet carcass to allow for the inserting of a back. The back could be plywood, or it could be a series of boards. Either way, the best way of putting these backs on is in such a way that the back of the back - is flush with the back of the carcass or it can even be inset a bit more, but definitely not sticking out from the back of the cabinet of box.
Back in the day when I first learned serious woodworking, we always cut the backs using a dado blade on the table saw. That's just the way things were done then. There wood routers, but they were uncommon, had very few bits and were really still in their infancy, so weren't even considered for this function back then ....