I'm thinking of buying my daughter a used ds lite or a new dsi but which one would be best to buy so she can play backups.
ds lites are cheaper and you can not update them so you wont block ya card, if its solely for playing backs up then the ds lite.
I suggest you buy the DS lite, and also buy another 3DS in future. By the way, you also need to buy a SD card and a flashcart to play games on it.
R4i sdhc-silver Card (Real Time Save) for 3DS Console/DS/NDSL/NDSI/NDSIXL/LL-8G with full games can be used directly after buy:
You need to buy a flashcart for your DSi. i racommend you buy r4i gold or acekard 2i, just take a look at here: http://www.dsflashcart.com/3ds-flashcart-c-54.html
It is depends on your requirement and budget that which one to buy DS lite or DSi. DS lite is less costly as compared DSi and provide less feature than DSi console.
i got one of each ds lite obviously you cant play dsi or 3ds games on it, but its easy as hell to play backups
can you simplify what you are saying please, the sentences don't make much sense, you buying a girl you don't know a ds.
I suggest you to buy Nintendo DSI gaming console because it provide better gaming experience and lots of advance feature that are not available in Nintendo DS lite.