Capacity of Selected Source Data for Perpetual Backup Jobs – is the maximum capacity that RRB™ allows you to select data for backup in all backup jobs (packs). It is calculated as the aggregate size of all of the files and folders you choose to backup in every backup job (pack).

For example, if in 'pack A' you have 10GB worth of files to backup and in 'pack B' you have 15GB of data to backup then you need a license with 25GB backup capacity, and you will be able to backup this data over and over again. Note that in the above described situation, the 45GB license will give your data plenty of room to grow.