File Replication for shared network folders is important so you can keep folders and files in sync across Multiple Locations. Below are some file replication tools. See also: Store Images in Database.

Microsoft Distributed File System (DFS)

http://technet.microsoft.com/en-us/library/cc753479(v=WS.10).aspx

This is a good folder replication technology if each replication server has a Windows Server operating system. It enables you to efficiently replicate folders (including those referred to by a DFS namespace path) across multiple servers and sites. You can use DFS Namespaces and DFS Replication to achieve the following goals:

• DFS Namespaces - Provide users with a centralized folder namespace through which to access and store files. You can host the underlying file shares on different servers and in different sites to improve availability and performance.
• DFS Replication - Synchronize folder contents efficiently between servers, across LAN or WAN network connections.

Other useful resources:

• DFS Namespaces and DFS Replication Overview: http://technet.microsoft.com/en-us/library/jj127250.aspx
• Deploying DFS Replication: http://technet.microsoft.com/en-us/library/cc770925.aspx

FreeFileSynch

http://www.freefilesync.org/manual.php?topic=external-applications

Free Open Source software that helps you synchronize files and folders for Windows, Linux and macOS.