What are some alternatives?
When comparing SugarSync and Dropbox, you can also consider the following products
Box - Box offers secure content management and collaboration for individuals, teams and businesses, enabling secure file sharing and access to your files online.
Google Drive - Access and sync your files anywhere
SpiderOak - SpiderOak makes it possible for you to privately store, sync, share & access your data from everywhere.
Mega - Secure File Storage and collaboration
Microsoft OneDrive - Secure access, sharing & file storage
ownCloud - ownCloud is an open source project enabling businesses to host their own cloud storage while maintaining regulatory and compliance needs.