Sync.com - Sync. com offers a backup tool and a file sharing service, rolled into one.
Google Drive - Access and sync your files anywhere
Yandex.Disk - Files on Yandex.Disk won't get lost if your phone or computer breaks.
Dropbox - Online Sync and File Sharing
Zoho WorkDrive - File storage & content collaboration tool for modern teams
Box - Box offers secure content management and collaboration for individuals, teams and businesses, enabling secure file sharing and access to your files online.