The Jottacloud Personal Service is aimed at individuals and smaller businesses who require powerful backup and storage sharing features but who only require one user.
You can start with a FREE account and backup/store 5 GB storage FREE, and upgrade when you are ready to UNLIMITED storage for just £90 plus VAT per annum.
Both services offer a FREE entry level point, and the "paid" entry point for both services is only £90 plus VAT per annum.
The main differences between Jottacloud's Personal and Business services are:
Personal: 1 user only and unlimited data storage.
Business: Multi users, initial 100 GB storage (extra blocks of 100 GB storage available at £70 plus VAT pa each).