When you use a copier device, you can write SRAM and Save States to disk. The disks were labeled for SRAM and Save State because they contained all the SRAM and Save States for the games I played. So rather than hunt for these things, I put in the disk and it has all the files there already. These backup devices generally costed around $280 to $380, depending on model, onboard RAM, and other features. If you convert that to your currency now, it would probably cost significantly more. But bare in mind, this was back in the day when RAM prices were sky high and electronics weren't so dirt cheap.
@Trenton_net ah okay, that's pretty convenient of you to do, speaking of the copier save states how does it work exactly if you could remember?
The SNES Game Doctor SF series supports Save States. When you select the mode that supports the feature you would just hold Select and Press L or R I think to either save or restore a state. However unlike an emulator for SNES you cannot actually restore the state of the entire machine exactly. So depending on the game the feature may work fine, or it could not work at all. There would be some games in between where in certain instances the feature would work and not in others. For example maybe during gameplay on certain levels or any level it would not be able to save and restore the state but between levels it could or something similar to that. The Game Doctor SF series would use one 8 megabit block for the save state feature. You would have different letters blocks of DRAM on your menu. Each block represents 8 megabits (1 megabyte) of DRAM. So earlier copiers like the Game Doctor SFIII would ship with 16 megabits meaning you could only use the save state feature in games 8 megabits or smaller. You could upgrade to 32 megabits in the GDSF3 and to over 32 megabits in the GDSF6 and GDSF7. I'm unfamiliar with any other copier's save state mechanism. I guess some might have had cartridges you could buy and insert into them for save state memory.