Why does QuikBACC prompt me for disk 4, when there are only 3 disk in the backup set?
If QuikBACC prompts you for more disks than are in the backup set, this means that one of more of the disks in the backup set has physical damage, and is not restorable. You will have to rely on another (probably older) set of backups. This is probably indicative of recycling diskettes without reformatting them. Sooner or later, diskettes wear out. The only way to know is to periodically reformat them, and throw away any diskette that doesn’t format 100% perfectly.