The free service is designed for personal and casual use only. It has quite some restrictions and is not suitable for business use. 

By default, you get 200MB download bytes/month; as you use more DriveHQ.com features and install DriveHQ client software / FTP hosting services, you will get more and more download bytes up to 1GB/month. Your download bytes is reset to 0 on your billing date, which is the day-of-month when you signed up DriveHQ.com.