Forget about floppies and just use a USB drive. Think about it -- if you need to make a rescue disc, you can do that with a USB drive which can hold a lot more than a floppy (say 1.44 megabytes on a floppy as opposed to 1 or more gigabytes on a thumb drive) and can be made usually be made bootable if your BIOS supports that option (it probably does).
Floppies are quickly becoming about as relevant as punch cards. For backup or anything else, a thumb drive will usually do the trick and you already have the equipment at hand to take advantage of it (assuming you have a computer made in this century, of course).
If you're just looking for a way to backup your files, you can get all the cloud storage you'll ever need for either free over for very, very little money.