I agree with amagadog and F_C that you should get a CD burner or if you have a USB port, a Memory Key of 128 MB for less than 50 Bucks. It is a must have because a floppy is really a No No. It is not as stable as a CD/DVD. It is a good investment that you will have to make for the future. And for Incremental backups, I do not think that such an animal exists. ???
Good luck

Regards 8)