File sharing between remote sites

What is the cheapest most sercure way to share data between 21 remote sites, the cost of linking all sites via VPN’s would be too much for the company.
Thank you for any suggestions in advance.
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John TsioumprisSoftware & Systems EngineerCommented:
You could either host or rent a VPS and host an FTP server...all remote sites will have access to it with user/group control and they can even map network folders as standard drives for everyone (with permissions) can access everything and files can be drag dropped...
JohnBusiness Consultant (Owner)Commented:
VPN is the accepted standard and any direct Internet connection would be unsafe.

So then consider commercial Dropbox as a way to share files. If using Windows 10 consider One Drive.
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