ERD Data

If I use drive IDE drive mirroring on NT, my ERD data seems to always be to large to fit on a floppy disk. I always copy the repair folder data to another work station for back up perposes but have never had to use it. My question is what good is itif I can’t get it on a floppy and how would I use it to restore if I had a problem? What would the procedure be.

Thanks
Bob