The Iomega® REV Professional Backup Kit is a revolutionary removable hard disk system which makes backing up and archiving easy by providing everything that is needed to keep critical data safe and secure. The Professional Backup Kit includes one Iomega REV 35GB/90GB* drive and six Iomega REV disks - one disk for each weekday backup and one disk for full system backup and disaster recovery - all at a value only Iomega can provide. Each backup kit also includes Iomega Automatic Backup Pro software for desktop users and Yosemite TapeWare® for REV drive software for server users - giving you professional-level full system backup capabilities.