Yes.
Stick the ?SD in your computer.
Open the saver directory in it.
Copy the files there (they should be named the same as the ROM) to wherever you want.
They are successfully backed up.
To restore make sure you have played another game first*. Put SD card in PC again, copy whatever save you want back to the saver folder, making sure the name is the same as the ROM on the SD card.
*if you play a game and it saves to the SRAM then it is in SRAM, before you power it back on and the save writes then if you overwrite the one on the card then all that will happen is the SRAM will overwrite that and another will have happened. If you know how to stop the save from overwriting on the cart (possible but most will not want to do this when you can just play another game first) then you can do that I guess.