There is no single product that does all that...
GB/C cheats: Action Replay and Gameshark (same thing, different names) patch RAM, Game Genie patches ROM - some codes are exclusive to one type but Gameshark is by far the most popular
GB/C save backups: Mega Memory Card if you don't need to actually copy the files to a computer, a flashcard programmer (GBT, GB X-changer, etc if you do)
Some do it yourself options with Arduino Mega
This is expensive but does GBA too: https://bennvenn.myshopify.com/collections/frontpage/products/reader-writer-gen2
GBA cheats: again there are 2 major designs each sold under 2 names: Gameshark/Action Replay vs Codebreaker/Xploder, popularity and functions roughly equal this time with a slight advantage of Gameshark
GBA saves: The above programmer, or a DS/Lite with a slot-1 flashcard and Rudolph's GBA Backup Tool
Yes, it was invented for that reasonOkay I want above all save backup and restore and can put the save on my computer
Can I do it with that ? (your link)
Thank you so much, but yes it's a little expensive ^^'Yes, it was invented for that reason
There is more than one GB/C emulator on the DS - but yeah, I get what you really meant and it won't work, because apart from the tabs (that can be removed) the DS doesn't have the 5 V logic required for GB/C cardsTo then find it cant, all because the GBA has a slight indented line on both edges of the game cart where the GB/C doesn't so they wont insert and yea likely the DSLite not having the emulator to play them.
Electrically they will work fine, but "long" cards on a GBA are already not ideal (easy to knock out while running), I suspect after adding these "extensions" it will be much worse... and at least some may not fit because of their design (one Action Replay was redesigned to fit better on the then new GBC)will GB/C cheat devices work on a GBA when playing GB/C games