Laura Yecies, CEO
Capacity: 5 GB free; 60 GB for $9.99/month
What it's for: Backups
Killer feature: Accessible on all operating systems and platforms
Funding: $51.5 million
Number of users: 25 million
Fun fact: Popular with the Cannes set
From new innovators to the old guard, these companies are experiencing phenomenal growth in the tech sector.