What are some alternatives?
Dropbox - Online Sync and File Sharing
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
Microsoft OneDrive - Secure access, sharing & file storage
Nextcloud - With Nextcloud enterprises host their own secure cloud solution for storage, collaboration & communication from any device, anywhere.
ownCloud - ownCloud is an open source project enabling businesses to host their own cloud storage while maintaining regulatory and compliance needs.