Dropbox - Online Sync and File Sharing
Backblaze - Backblaze's remote backup automatically backs up your data to our secure datacenter.
ownCloud - ownCloud is an open source project enabling businesses to host their own cloud storage while maintaining regulatory and compliance needs.
SpiderOak - SpiderOak makes it possible for you to privately store, sync, share & access your data from everywhere.
Mega - Secure File Storage and collaboration
CrashPlan - CrashPlan for Small Business backup software offers the best way to back up and store business & enterprise data securely - offsite, onsite & online in the Cloud.