The banks can be saved to one's memory card. From there they can be backed up to one's primary computer. Whenever a card is formatted the banks need to be restored to the memory card. I only format a memory card at my primary computer and only after backup NEF(s) to three HD(s). I only format a memory card about every two weeks.
All the banks are saved to a BIN file. This files can be write protected by one's primary computer when the card is in a card reader. I one tries to over-write the BIN files and error message say something about file can not be created. For a camera with two memory bays the primary can be popped out and then a new BIN file can be written. I do this quite infrequently, perhaps once or twice in six months.
A "My Menu" can be created and I place the load/save settings in the middle of the first page. I use four pairs of banks, General, Action, Cinema and DX Interval. General and Action are the same except some auto stuff is not used like Auto Distortion because it use the same memory as the buffer and so fewer photos can be taken before filling the buffer. Cinema, a bit lofty for what I do, is for when I dabble in video.
What I'd like is not a U1/U2 switch on the outside of the camera but I'd like a U1-U4 accessed by double pressing the info button. I like the custom settings and shooting menus just as they are. I just don't like having to select each independently which I do on the first page of my menu.
Hope this helps,
Dave Hartman