Please note the free service is designed for personal and casual use only. Usually it means uploading / downloading 50 photos, etc. Uploading/downloading of files larger than 50MB is generally not considered as casual use.
A free account is given 200MB download bytes initially. You can get more download bytes by using more DriveHQ features:
http://www.drivehq.com/freeBandwidth.aspx
Of course, after you have learned our great features, and used our high quality software, we hope you will sign up our premium service. After all, the starting price of $29.99/year is even cheaper than many desktop applications.