Many years ago (aka 1997), I was working in a library where we backed up our circulation system every day on floppy disks. We did daily backups of just those transactions performed that day. We could also do weekly backups and full backups . Doing the full backup everyday was impractical due to the vast amount of time one spent switching floppies (and these were 3 1/2″) as well as the write speed. One Christmas there was a major storm that came through and leveled the library at a nearby campus. Fortunately, the librarian had taken time to do a full backup just a few days before. It helped a great deal in putting the collection back together. Eventually, out of frustration, I brought my own 100MB Zip Drive in and we used that to backup. We could do a few backup in just a few moments. Periodically, I would store one of those in a safe place. In fact, I discovered an old folder on my hard drive the other day that still had a one of those 6.33 MB backups. In fact, I eventually discovered that I could also drag the entire folder containing the circulation system on to the drive in the same amount of time. Nowadays there are so many options. In addition to “CD-RW drives(Hilary Rosen Christmas Nightmare)”:http://www.libraryplanet.com/2002/12/nightmare and “Key drives”:http://www.libraryplanet.com/2003/04/usb, you can use inexpensive Memory Card Readers and Cards. I bought my father and brother 256MB Compact Flash Cards last week for 50 dollars after all the rebates. These days every library should be backed up fully on a regular basis.