Relative Rev Backup (RRB) is an intuitive backup software solution that also includes a unique disk library management system which converts any hard disk into a managed backup library - maximizing the retention of backup versions while minimizing the required amount of backup space and time. RRB allows users to accurately restore files and folders that were lost days, weeks, and in some editions even months and years ago. To avoid the need to multiply the backup space with every weekly or monthly backup session, as necessary with other backup solutions, RRB copies only the new and changed files (incremental backup forever), compresses files, removes duplicate files, and automatically cleanses the space of expired backup versions. RRB is highly automated, requires minimum attention, provides security and reliability using encryption and disk redundancy, and allows to search for lost files across all retained backup versions. Price of software varies according to edition and capacity of select source data for perpetual backup jobs.