What are some alternatives?
Dropbox - Online Sync and File Sharing
ownCloud - ownCloud is an open source project enabling businesses to host their own cloud storage while maintaining regulatory and compliance needs.
Google Drive - Google Drive is a personal cloud storage service from Google that lets users store and synchronize digital content across computers, laptops and mobile devices, including Android-powered tablet and smartphone devices.
Mega - Secure File Storage and collaboration
Syncthing - Syncthing replaces proprietary sync and cloud services with something open, trustworthy and...
Microsoft OneDrive - Secure access, sharing & file storage