Sync.com - Sync. com offers a backup tool and a file sharing service, rolled into one.
Dropbox - Online Sync and File Sharing
Zoho WorkDrive - File storage & content collaboration tool for modern teams
ownCloud - ownCloud is an open source project enabling businesses to host their own cloud storage while maintaining regulatory and compliance needs.
Bitwarden Send - Easily transmit text or files fully encrypted
Mega - Secure File Storage and collaboration