I've got a sizable number of X68k titles and would like to back 'em up. I'd also like to be able to transfer the rare disk images of games I don't own (i.e. the Darius games) to 5.25" disks.
I know that there exists a tool that lets you read 3.5" MSX2 floppies on a PC (I haven't tried it out yet because it warns of data loss; I'll probably just use it to load an image and try playing that on my MSX2+ when it gets here). If something like that exists that'd be the optimal way of doing it.