PureSync by Jumping Bytes is a Windows program to synchronize files and folders, and to do backups e.g.
Side by side compare view
Automatic synchronization and backups
NAS and FTP support
Easy to use but still many options
It's free*
This program received 9 awards
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This software is a must, he told me facilitate my work, and helped to save and update my files. Thank you once again.