I bought a $40 external 3½" floppy drive at WalMart about two years ago. I have used it about two or three times. Floppies are just about too small for anything anymore. Get yourself a USB flash memory device, you can get them 256MB, 512MB and 1GB now, and larger sizes shortly.
But, for backups, you can make permanent backups to CDs by sending the backup to the hard drive and copying that zip file to a CD with the CD writiong software.
The CD is probably large enough to hold several backups, you could store a weeks worth of backups on your hard drive, with dated names, then copy them all to one CD for archival purposes.
