it's been a while since i set my old copiers up but if i remember correctly you could make a snapshot save by pressing certain buttons combos. used to explain how to do it in the manual and at the copier os screen. this function comes in handy when playing a difficult game that has nasty passwords or not enough continues. thinking back thou the option may only have worked while the machine was still on. i don't think you could back the snapshot image up like an sram reguler save. i used to have floppys just for saves but don't think i could ever back up the snapshots. still most those games were rather short and the function could help you get through a lot of games in one sitting. was just thinking if i played a game with the flash cart inserted if i could still use the wild card functions and take advantage of this function.
curiosity got the better of me and i just checked my manual. all coming back now. you had to chosse to play the game in memory mode and then button combo L+start would make real time save R+start would perform real time load and L,R+start would bring up another menu where you could backup the real time save to disk for future use. works with about 85 percent of games the manual says as some games didn't work well with this function. i used to use it quite a bit and was cool tbh. i never made disk backup of a state thou, didn't know you could lol. it was just handy for beating games like chuck rock in one sitting.
the manual i refer to is for super wild card for the snes made by front far east company. i also have the super magic drive plus for the megadrive/genesis made by the same people and i think it had mostly the same functions as the wild card. i cant rmemeber 100 percent if it had the memory mode function and i don't have the manual for the magic drive anymore.