It appears that Datel’s infamous Powersaves 3DS device, an unofficial product that allows players to backup, edit, and restore save files to 3DS games, will only work for Windows users for the foreseeable future. Their website previously stated that a Mac OS X version was “Coming Soon,” but this has since been removed completely.
Codejunkies, the group behind the Powersaves software, confirmed via email that this was no accident.
Thank you for your recent enquiry unfortunately MAC compatible software will no longer be available in the future.
Looks like if you still want to backup save files on your Mac, it will cost you a full copy of Windows and a Boot Camp installation.